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TextBoxBase.Undo Method

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

Namespace:  System.Windows.Controls.Primitives
Assembly:  PresentationFramework (in PresentationFramework.dll)

public bool Undo()

Return Value

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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