# NameValueCollectionSurrogate.NullKeyValue

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.namevaluecollectionsurrogate/) | [Fields](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.namevaluecollectionsurrogate/fields/)

```csharp
[Orleans.Id(2)]
public string? NullKeyValue
```

Gets or sets the value associated with the null key.