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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 Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Media Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()       DataContext = Me     End Sub     '     Private Sub TextBox_PreviewKeyDown(sender As Object, e As RoutedEventArgs)       Dim textBox As TextBox = TryCast(sender, TextBox)       If textBox IsNot Nothing Then         textBox.Foreground = Brushes.Firebrick       End If     End Sub   End Class End Namespace