# OpcMonitoredItemEventHandler Delegate

> Reference: Represents the method that will handle MonitoredItemCreated, MonitoredItemDeleted and MonitoredItemModified events.

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.server">Opc.UaFx.Server</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
</dl>

Represents the method that will handle [MonitoredItemCreated](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemcreated), [MonitoredItemDeleted](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemdeleted) and [MonitoredItemModified](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemmodified) events.

## Syntax

<div class="api-signature" data-lang="csharp">

```csharp
public delegate void OpcMonitoredItemEventHandler(
    object sender,
    OpcMonitoredItemEventArgs e)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Delegate Sub OpcMonitoredItemEventHandler(
    sender As Object,
    e As OpcMonitoredItemEventArgs)
```

</div>

## Parameters

| Name | Type | Description |
|---|---|---|
| `sender` | [Object](https://learn.microsoft.com/dotnet/api/system.object) | The source of the event (typically an instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class). |
| `e` | [OpcMonitoredItemEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventargs/) | An instance of the [OpcMonitoredItemEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventargs/) class containing the event data. |

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.5–v2.59 |