# DotNetSerializableCodec.WriteField(Writer<TBufferWriter>, uint, Type, object)

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/ISerializableSerializer/DotNetSerializableCodec.cs#L65-L83)

```csharp
public void WriteField<TBufferWriter>(ref Writer<TBufferWriter> writer, uint fieldIdDelta, Type expectedType, object value)
```

Writes a field using the provided untyped value. The type must still match the codec instance!

### Parameters

- `writer` (`Writer<TBufferWriter>`)
- `fieldIdDelta` (`uint`)
- `expectedType` (`Type`)
- `value` (`object`)