# IPurgeObservable Methods

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

## RemoveOldestMessage {#removeoldestmessage-d50debe0}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ipurgeobservable/methods/removeoldestmessage-d50debe0/)

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

Removes oldest message in the cache.