# UndoEventArgs class

Namespace: [Grasshopper2.Undo](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.undo.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public sealed class UndoEventArgs : EventArgs
```

Event arguments used in various [History](https://developer.rhino3d.com/api/gh2/type/grasshopper2.undo.history.md) events.

## Constructors

- [UndoEventArgs](https://developer.rhino3d.com/api/gh2/type/grasshopper2.undo.undoeventargs/ctor.md)

## Properties

- [History](https://developer.rhino3d.com/api/gh2/type/grasshopper2.undo.undoeventargs/history.md): Gets the history instance associated with this event.