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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.vb Imports System Imports System.Windows Imports System.Windows.Input Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub TextBox_TextEvent(sender As Object, e As TextCompositionEventArgs)       Dim msg As [String] = [String].Format("{0} - {1}" & vbLf, e.RoutedEvent.Name, e.Text)       txtLog.Text += msg       txtLog.ScrollToEnd()     End Sub   End Class End Namespace