---
title: "Aurigma.GraphicsMill.AjaxControls.VectorObjects.RedoUndo Namespace"
canonical: https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_AjaxControls_VectorObjects_RedoUndo.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/)

# Aurigma.GraphicsMill.AjaxControls.VectorObjects.RedoUndo Namespace
 
The Aurigma.GraphicsMill.AjaxControls.VectorObjects.RedoUndo namespace contains classes intended to operate with history.
 
## Classes

|   |  Class |  Description |
| --- | --- | --- |
 |  ![Public class](https://www.graphicsmill.com/docs/gm5/icons/pubclass.gif) |  [Command](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_AjaxControls_VectorObjects_RedoUndo_Command.htm.md) |  This is a base class for all client-side commands. |
 |  ![Public class](https://www.graphicsmill.com/docs/gm5/icons/pubclass.gif) |  [History](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_AjaxControls_VectorObjects_RedoUndo_History.htm.md) |  This class represents a history of modifications applied to the [Canvas](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_AjaxControls_VectorObjects_Canvas.htm.md) content. |
 |  ![Public class](https://www.graphicsmill.com/docs/gm5/icons/pubclass.gif) |  [HistoryData](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_AjaxControls_VectorObjects_RedoUndo_HistoryData.htm.md) |  This class represents a state of a history and allows applying this state to the [History](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_AjaxControls_VectorObjects_RedoUndo_History.htm.md) class instance. |
 
## Structures

|   |  Structure |  Description |
| --- | --- | --- |
 |  ![Public structure](https://www.graphicsmill.com/docs/gm5/icons/pubstructure.gif) |  [HistoryTypeData](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_AjaxControls_VectorObjects_RedoUndo_HistoryTypeData.htm.md) |  Represents a pair of command type and its data. |