TextBoxBase.Undo Method

Definition

Namespace:

System.Windows.Controls.Primitives

Assembly:

PresentationFramework.dll

Undoes the most recent undo command. In other words, undoes the most recent undo unit on the undo stack.

public:
 bool Undo();

public bool Undo ();

member this.Undo : unit -> bool

Public Function Undo () As Boolean

Returns

Boolean

true if the undo operation was successful; otherwise, false. This method returns false if the undo stack is empty.

Examples

The following example demonstrates how to use the Undo method.

private void undoAction(object sender, RoutedEventArgs e)
{
    if (myTextBox.CanUndo == true)
    {
        myTextBox.Undo();
    }
}

Private Sub undoAction(ByVal sender As Object, ByVal e As RoutedEventArgs)
    If myTextBox.CanUndo = True Then
        myTextBox.Undo()
    Else : Return
    End If
End Sub

See also

• Redo()
• BeginChange()
• EndChange()
• DeclareChangeBlock()
• LockCurrentUndoUnit()