# ReferencedObjectCollection.MarkValueField

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Session/ReferencedObjectCollection.cs#L71)

```csharp
public void MarkValueField()
```

Marks a value field.