# OpcDataChangeFilter Class

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx">Opc.UaFx</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Members</dt>
<dd><a href="./members">OpcDataChangeFilter Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Defines the conditions under which a data change notification is to be reported.

## Syntax

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

```csharp
public class OpcDataChangeFilter : OpcMonitoringFilter
```

</div>

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

```vbnet
Public Class OpcDataChangeFilter
    Inherits OpcMonitoringFilter
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [OpcMonitoringFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmonitoringfilter/) → **OpcDataChangeFilter**

## Remarks

Using an instance of the OpcDataChangeFilter enables the possibility to optionally define a range or band for value changes where no data change notification is generated. This range is called 'deadband'.

## Constructors

| Name | Description |
|---|---|
| [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#opcdatachangefilter)<span class="api-meta">2 overloads</span> | Initializes a new instance of the OpcDataChangeFilter class. |

## Properties

| Name | Description |
|---|---|
| [DeadbandType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#deadbandtype)<span class="api-meta">since v2.6</span> | Gets or sets a value which defines how value changes shall be classified as part of the 'deadband' or the 'liveband'. |
| [DeadbandValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#deadbandvalue)<span class="api-meta">since v2.6</span> | Gets or sets the limit of the 'band'-logic used to classify value changes as part of the 'deadband' or the 'liveband'. |
| [Trigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#trigger)<span class="api-meta">since v2.6</span> | Gets or sets a value which specifies the conditions under which a data change notification is to be reported. |

## Applies to

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