# BufferSlice.CopyTo(Span<byte>)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.pooledbuffer.bufferslice/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.pooledbuffer.bufferslice/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Buffers/PooledBuffer.cs)

```csharp
public int CopyTo(Span<byte> output)
```

Copies the contents of this writer to a span.

### Parameters

- `output` (`Span<byte>`)