# IEvictionStrategy.PerformPurge(DateTime)

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

```csharp
public abstract void PerformPurge(DateTime utcNow)
```

Method which should be called when pulling agent try to do a purge on the cache

### Parameters

- `utcNow` (`DateTime`): The current time (UTC)