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TextBox changed event

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'      d:DesignWidth='640'      d:DesignHeight='480'>   <StackPanel>         <TextBlock Text="Type here:"></TextBlock>     <TextBox KeyDown="txt_KeyDown" KeyUp="txt_KeyUp" TextChanged="txt_TextChanged"></TextBox>     <ListBox Margin="5" x:Name="lstMessages"></ListBox>     <Button Click="cmdClear_Click" HorizontalAlignment="Right" Content="Clear List"></Button>   </StackPanel> </UserControl> //File: Page.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }         private void txt_KeyUp(object sender, KeyEventArgs e)         {             string message = "KeyUp " + " Key: " + e.Key;             lstMessages.Items.Add(message);         }         private void txt_KeyDown(object sender, KeyEventArgs e)         {                        string message = "KeyDown " + " Key: " + e.Key;             lstMessages.Items.Add(message);         }         private void txt_TextChanged(object sender, TextChangedEventArgs e)         {             string message = "TextChanged";             lstMessages.Items.Add(message);         }         private void cmdClear_Click(object sender, RoutedEventArgs e)         {             lstMessages.Items.Clear();         }     } }