TextBoxBase.Redo Method   
Definition
Important
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Undoes the most recent undo command. In other words, redoes the most recent undo unit on the undo stack.
public:
 bool Redo();public bool Redo();member this.Redo : unit -> boolPublic Function Redo () As BooleanReturns
true if the redo operation was successful; otherwise, false. This method returns false if there is no undo command available (the undo stack is empty).
Examples
The following example demonstrates how to use the Redo method.
private void redoAction(object sender, RoutedEventArgs e)
{
    if (myTextBox.CanRedo)
    {
        myTextBox.Redo();
    }
}
Private Sub redoAction(ByVal sender As Object, ByVal e As RoutedEventArgs)
    If myTextBox.CanRedo = True Then
        myTextBox.Redo()
    Else : Return
    End If
End Sub