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TextBox Selection start, end and selected text

<Window x:Class="ClassicControls.TextBoxTest"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="TextBoxTest" Height="325" Width="390">   <Grid Margin="5">     <Grid.RowDefinitions>       <RowDefinition Height="2*"></RowDefinition>       <RowDefinition Height="*"></RowDefinition>     </Grid.RowDefinitions>     <TextBox  Name="txt" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap" AcceptsReturn="True"                SelectionChanged="txt_SelectionChanged"                SpellCheck.IsEnabled="True">this is a test</TextBox>   </Grid> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; namespace ClassicControls {     public partial class TextBoxTest : System.Windows.Window     {         public TextBoxTest()         {             InitializeComponent();         }         private void txt_SelectionChanged(object sender, RoutedEventArgs e)         {             Console.WriteLine(txt.SelectionStart);             Console.WriteLine(txt.SelectionLength);             Console.WriteLine(txt.SelectedText);         }     } }