The control supports multi levels undo/redo support. The CTRL + Z reverses the last editing action, The CTRL + Y restores the previously undone action. Use the Redo method to redo the next action in the control's redo queue. Use the CanUndo property to determine by code whether an undo operation is available. Use the CanRedo property  to determine by code whether a redo operation is available. Use the Undo method to undo the last edit-control operation.