---
title: "Bitmap..::.Undoing Event"
canonical: https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_Bitmap_Undoing.htm
product: "Graphics Mill 5.5 for .NET"
---

This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)

# Bitmap.Undoing Event
 
Fires when image is being undone (before starting).
 
**Namespace:** [Aurigma.GraphicsMill](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```
Protected Overridable Event Undoing As StateRestoringEventHandler
```
 
```csharp
protected virtual event StateRestoringEventHandler Undoing
```
 
### Implements
 
[IStateNavigable.Undoing](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_IStateNavigable_Undoing.htm.md)
 
## Remarks
 You can cancel undoing from this event by setting [Cancel](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_BitmapChangingEventArgs_Cancel.htm.md) argument to **false**. To get information what action is being undone, use argument [Change](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_BitmapChangingEventArgs_Change.htm.md).
   
## See Also

### Reference

- [Bitmap Class](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Bitmap.htm.md)
- [Aurigma.GraphicsMill Namespace](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill.htm.md)