# ArcBufferPage.CheckValidity(int)

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Buffers/ArcBufferWriter.cs#L1035-L1044)

```csharp
public void CheckValidity(int token)
```

Throws if the provided `token` does not match the page's [ArcBufferPage](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.arcbufferpage/).

### Parameters

- `token` (`int`): The token, which must match the page's [ArcBufferPage](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.arcbufferpage/).