# Grain.OnActivateAsync(CancellationToken)

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/Core/Grain.cs#L157)

```csharp
public virtual Task OnActivateAsync(CancellationToken cancellationToken)
```

This method is called at the end of the process of activating a grain. It is called before any messages have been dispatched to the grain. For grains with declared persistent state, this method is called after the State property has been populated.

### Parameters

- `cancellationToken` (`CancellationToken`): A cancellation token which signals when activation is being canceled.