# IActivationWorkingSet.OnActivated(IActivationWorkingSetMember)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.iactivationworkingset/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.iactivationworkingset/methods/)

```csharp
public abstract void OnActivated(IActivationWorkingSetMember member)
```

Adds a new member to the working set.

### Parameters

- `member` (`IActivationWorkingSetMember`)