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On Key Down Handler

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="KeyDown Sample" Height="400" Width="500">   <StackPanel>     <TextBlock Width="300" Height="20">       Type some text into the TextBox and press the Enter key.     </TextBlock>     <TextBox Width="300" Height="30" Name="textBox1"              KeyDown="OnKeyDownHandler"/>     <TextBlock Width="300" Height="100" Name="textBlock1"/>   </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Input; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();         }         private void OnKeyDownHandler(object sender, KeyEventArgs e)         {             if (e.Key == Key.Return)             {                 textBlock1.Text = "You Entered: " + textBox1.Text;             }         }     } }