# Writer<TBufferWriter>.WriteUInt64(ulong)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.writer-1/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.writer-1/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Buffers/Writer.cs#L406-L418)

```csharp
public void WriteUInt64(ulong value)
```

Writes the provided `System.UInt64` to the output buffer.

### Parameters

- `value` (`ulong`): The value.