# IPurgeObservable.RemoveOldestMessage

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ipurgeobservable/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ipurgeobservable/methods/)

```csharp
public abstract void RemoveOldestMessage()
```

Removes oldest message in the cache.