# FixedSizeBuffer.Id

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.fixedsizebuffer/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.fixedsizebuffer/properties/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Streaming/Common/PooledCache/FixedSizeBuffer.cs#L23)

```csharp
public object Id
```

Unique identifier of this buffer.