# ILifecycleObserver.OnStop(CancellationToken)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.ilifecycleobserver/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.ilifecycleobserver/methods/)

```csharp
public abstract Task OnStop(CancellationToken cancellationToken = default(CancellationToken))
```

Handle stop notifications.

### Parameters

- `cancellationToken` (`CancellationToken`): The cancellation token which indicates that the operation should be stopped promptly when it is canceled.

### Returns

A `System.Threading.Tasks.Task` which represents the operation.