# IsValid

> Indicates whether this context can still be used. The value becomes false after Context.Dispose is called.

## Definition

* **Type:** Property
* **Namespace:** [Unity.GraphToolkit.Editor.GraphVisualization](/engine/6000.7/script-reference/unity/graphtoolkit/editor/graphvisualization.md)
* **Assembly:** UnityEditor

```csharp
public bool IsValid { get; }
```