Undoes the content contained in this undo unit.
public abstract void Undo()
Undo operations toggle an object between the undo and redo state. Therefore, calling this method twice sets the object back to its original state.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.