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Handler for the PreviewKeyDown event on the TextBox

<Window x:Class="WpfApplication1.Window1"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="Window1" Height="300" Width="300">   <Grid>     <StackPanel>       <TextBox x:Name="uv" PreviewKeyDown="TextBox_PreviewKeyDown" />     </StackPanel>   </Grid> </Window> //File:Window1.xaml.cs using System.Windows; using System.Windows.Controls; using System.Windows.Media; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();             DataContext = this;         }         //         private void TextBox_PreviewKeyDown(object sender, RoutedEventArgs e)         {             TextBox textBox = sender as TextBox;             if (textBox != null)             {                 textBox.Foreground = Brushes.Firebrick;             }         }     } }