# OpcSubscribeDataChange Members > Reference: Represents a single OPC UA service command which addresses the 'CreateSubscription' service to define a single monitored item to monitor data changes through a subscription using the setup represented.
Type
OpcSubscribeDataChange
Namespace
Opc.UaFx.Client
Assembly
Opc.UaFx.Advanced.dll
Package
Opc.UaFx.Advanced v2.59.0
Also in
Opc.UaFx.Client
Inherits members from [OpcSubscribeNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribenode/members), [OpcNodeAttributeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeattributeservicecommand/members), [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members), [OpcServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcservicecommand/members). ## Constructors ### OpcSubscribeDataChange 66 overloads | Overload | Description | |---|---| | [OpcSubscribeDataChange(byte\[\], OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(Guid, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(int, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(uint, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(string, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(byte\[\], OpcAttribute, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(Guid, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(int, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(uint, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(string, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(byte\[\], int, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-system-int32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(Guid, int, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-system-int32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(int, int, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-system-int32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(uint, int, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-system-int32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(string, int, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-system-int32-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(byte\[\], int, OpcAttribute, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-system-int32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(Guid, int, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-system-int32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(int, int, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-system-int32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(uint, int, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-system-int32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(string, int, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-system-int32-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(byte\[\], OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(byte\[\], OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(Guid, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(Guid, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(uint, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(uint, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(string, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(string, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(byte\[\], OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(byte\[\], OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(Guid, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(Guid, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(uint, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(uint, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(string, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(string, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(byte\[\], int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-system-int32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(byte\[\], int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-system-int32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(Guid, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-system-int32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(Guid, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-system-int32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(int, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-system-int32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(int, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-system-int32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(uint, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-system-int32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(uint, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-system-int32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(string, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-system-int32-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(string, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-system-int32-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(byte\[\], int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(byte\[\], int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](#opcsubscribedatachange-system-byte-array-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(Guid, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(Guid, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-guid-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(int, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(int, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-int32-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(uint, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(uint, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-uint32-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(string, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(string, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-system-string-system-int32-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`. | | [OpcSubscribeDataChange(OpcNodeId, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-opc-uafx-opcnodeid-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(OpcNodeId, OpcAttribute, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-opc-uafx-opcnodeid-opc-uafx-opcattribute-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(OpcNodeId, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-opc-uafx-opcnodeid-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(OpcNodeId, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-opc-uafx-opcnodeid-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | [OpcSubscribeDataChange(OpcNodeId, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-opc-uafx-opcnodeid-opc-uafx-opcattribute-opc-uafx-opcdatachangefilter-opc-uafx-client-opcdatachangereceivedeventhandler) | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | | [OpcSubscribeDataChange(OpcNodeId, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/members#opcsubscribedatachange-opc-uafx-opcnodeid-opc-uafx-opcattribute-opc-uafx-opcdatachangetrigger-opc-uafx-client-opcdatachangereceivedeventhandler)since v2.6 | Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The command does not support empty node identifiers. | #### OpcSubscribeDataChange(byte\[\], OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( byte[] nodeId, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New(nodeId As Byte(), received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( Guid nodeId, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New(nodeId As Guid, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( int nodeId, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New(nodeId As Integer, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( uint nodeId, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( string nodeId, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New(nodeId As String, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( byte[] nodeId, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( Guid nodeId, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( int nodeId, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( uint nodeId, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( string nodeId, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], int, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( byte[] nodeId, int namespaceIndex, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), namespaceIndex As Integer, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, int, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( Guid nodeId, int namespaceIndex, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, namespaceIndex As Integer, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, int, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( int nodeId, int namespaceIndex, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, namespaceIndex As Integer, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, int, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( uint nodeId, int namespaceIndex, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, namespaceIndex As Integer, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, int, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( string nodeId, int namespaceIndex, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, namespaceIndex As Integer, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], int, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( byte[] nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), namespaceIndex As Integer, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, int, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( Guid nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, namespaceIndex As Integer, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, int, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( int nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, namespaceIndex As Integer, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, int, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( uint nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, namespaceIndex As Integer, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, int, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( string nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, namespaceIndex As Integer, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( byte[] nodeId, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( byte[] nodeId, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( Guid nodeId, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( Guid nodeId, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( int nodeId, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( int nodeId, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( uint nodeId, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( uint nodeId, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( string nodeId, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( string nodeId, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( byte[] nodeId, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( byte[] nodeId, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( Guid nodeId, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( Guid nodeId, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( int nodeId, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( int nodeId, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( uint nodeId, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( uint nodeId, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( string nodeId, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( string nodeId, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( byte[] nodeId, int namespaceIndex, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), namespaceIndex As Integer, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( byte[] nodeId, int namespaceIndex, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), namespaceIndex As Integer, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( Guid nodeId, int namespaceIndex, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, namespaceIndex As Integer, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( Guid nodeId, int namespaceIndex, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, namespaceIndex As Integer, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( int nodeId, int namespaceIndex, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, namespaceIndex As Integer, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( int nodeId, int namespaceIndex, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, namespaceIndex As Integer, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( uint nodeId, int namespaceIndex, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, namespaceIndex As Integer, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( uint nodeId, int namespaceIndex, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, namespaceIndex As Integer, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, int, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( string nodeId, int namespaceIndex, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, namespaceIndex As Integer, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, int, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( string nodeId, int namespaceIndex, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, namespaceIndex As Integer, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( byte[] nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), namespaceIndex As Integer, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(byte\[\], int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( byte[] nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Byte(), namespaceIndex As Integer, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( Guid nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, namespaceIndex As Integer, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(Guid, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( Guid nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Guid, namespaceIndex As Integer, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( int nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, namespaceIndex As Integer, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(int, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( int nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As Integer, namespaceIndex As Integer, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( uint nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, namespaceIndex As Integer, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(uint, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( uint nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As UInteger, namespaceIndex As Integer, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, int, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( string nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, namespaceIndex As Integer, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(string, int, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` and `namespaceIndex` specified to operate on the `attribute`.
```csharp public OpcSubscribeDataChange( string nodeId, int namespaceIndex, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As String, namespaceIndex As Integer, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate on its `attribute`. | | `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | #### OpcSubscribeDataChange(OpcNodeId, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( OpcNodeId nodeId, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As OpcNodeId, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). | #### OpcSubscribeDataChange(OpcNodeId, OpcAttribute, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( OpcNodeId nodeId, OpcAttribute attribute, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As OpcNodeId, attribute As OpcAttribute, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). | #### OpcSubscribeDataChange(OpcNodeId, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( OpcNodeId nodeId, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As OpcNodeId, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). | #### OpcSubscribeDataChange(OpcNodeId, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute.
```csharp public OpcSubscribeDataChange( OpcNodeId nodeId, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As OpcNodeId, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node on which the service, who will execute this command, will operate on its [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). | #### OpcSubscribeDataChange(OpcNodeId, OpcAttribute, OpcDataChangeFilter, OpcDataChangeReceivedEventHandler) Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( OpcNodeId nodeId, OpcAttribute attribute, OpcDataChangeFilter filter, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As OpcNodeId, attribute As OpcAttribute, filter As OpcDataChangeFilter, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `filter` | [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) | The [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) to be used by the server's subscription to - which the monitored item belongs - to filter the change data before it is reported to the client, which owns the monitored item described by the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) command. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). | #### OpcSubscribeDataChange(OpcNodeId, OpcAttribute, OpcDataChangeTrigger, OpcDataChangeReceivedEventHandler) since v2.6 Initializes a new instance of the [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) class using the `nodeId` specified to operate on the `attribute` defined.
```csharp public OpcSubscribeDataChange( OpcNodeId nodeId, OpcAttribute attribute, OpcDataChangeTrigger trigger, OpcDataChangeReceivedEventHandler received) ```
```vbnet Public Sub New( nodeId As OpcNodeId, attribute As OpcAttribute, trigger As OpcDataChangeTrigger, received As OpcDataChangeReceivedEventHandler) ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node on which the service, who will execute this command, will operate on its `attribute`. | | `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. | | `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | The conditions used by the server under which a data change is to be reported. | | `received` | [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) | The [OpcDataChangeReceivedEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdatachangereceivedeventhandler/) method to assign as the event handler of the [DataChangeReceived](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/members#datachangereceived) event or a null reference (Nothing in Visual Basic) if there no event handler is to be assigned first. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |