# IChangeNotifier Interface

Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)  
Assembly: Qlik.Engine.dll

Interface used by classes that supports change notification.

## Syntax

```
public interface IChangeNotifier
```

## Events

| Name | Description |
| --- | --- |
| [Changed](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IChangeNotifier.Changed.htm) | This event fires when to notify subscribers that a change has occured. |