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TextBox TextInput

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="WPF " Height="300" Width="300">     <DockPanel LastChildFill="True">         <TextBox DockPanel.Dock="Top" TextInput="TextBox_TextEvent" />         <TextBox Name="txtLog" HorizontalAlignment="Stretch"                   IsReadOnly="True" VerticalScrollBarVisibility="Visible"/>     </DockPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Input; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();         }         private void TextBox_TextEvent(object sender,TextCompositionEventArgs e)         {             String msg = String.Format("{0} - {1}\n",                 e.RoutedEvent.Name, e.Text);             txtLog.Text += msg;             txtLog.ScrollToEnd();         }     } }