# ReferenceCodec.WriteNullReference(Writer<TBufferWriter>, uint)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.referencecodec/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.referencecodec/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Codecs/ReferenceCodec.cs#L106-L109)

```csharp
public static void WriteNullReference<TBufferWriter>(ref Writer<TBufferWriter> writer, uint fieldId)
```

Writes the null reference.

### Parameters

- `writer` (`Writer<TBufferWriter>`): The writer.
- `fieldId` (`uint`): The field identifier.