# Writer<TBufferWriter>.WriteVarInt64(long)

[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.VarInt.cs#L33)

```csharp
public void WriteVarInt64(long value)
```

Writes a variable-width `System.Int64`.

### Parameters

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