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Get selected text from RichTextBox by using RichTextBox Selection Text

<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="600" Width="800">   <DockPanel>     <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal">       <TextBox x:Name="tbxInsertionText" Width="200" Margin="5,0" />       <Button DockPanel.Dock="Bottom" Content="Insert" Click="btnInsert_Click"/>     </StackPanel>     <RichTextBox x:Name="rtbTextContent" />   </DockPanel> </Window> //File:Window.xaml.vb Imports System.Windows Imports System.Windows.Documents Imports System.Windows.Input Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub btnInsert_Click(sender As Object, e As RoutedEventArgs)       If String.IsNullOrEmpty(tbxInsertionText.Text) Then         Return       End If       rtbTextContent.BeginChange()       If rtbTextContent.Selection.Text <> String.Empty Then         rtbTextContent.Selection.Text = String.Empty       End If       Dim tp As TextPointer = rtbTextContent.CaretPosition.GetPositionAtOffset(0, LogicalDirection.Forward)       rtbTextContent.CaretPosition.InsertTextInRun(tbxInsertionText.Text)       rtbTextContent.CaretPosition = tp       rtbTextContent.EndChange()       Keyboard.Focus(rtbTextContent)     End Sub   End Class End Namespace