TextBoxBase.Undo Method ()
.NET Framework (current version)
Undoes the most recent undo command. In other words, undoes the most recent undo unit on the undo stack.
PresentationFramework (in PresentationFramework.dll)
Public Function Undo As Boolean
true if the undo operation was successful; otherwise, false. This method returns false if the undo stack is empty.
The following example demonstrates how to use the Undo method.
Private Sub undoAction(ByVal sender As Object, ByVal e As RoutedEventArgs)
If myTextBox.CanUndo = True Then
Else : Return
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Available since 3.0