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Get selected item count from Listbox

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         x:Class="AboutDialog" ListBox.SelectionChanged="ListBox_SelectionChanged"         Button.Click="Button_Click"         Title="About WPF Unleashed" SizeToContent="WidthAndHeight"         Background="OrangeRed">   <StackPanel>     <Label FontWeight="Bold" FontSize="20" Foreground="White">       WPF     </Label>     <Label>License</Label>     <Label>Installed Dll:</Label>     <ListBox>       <ListBoxItem>1</ListBoxItem>       <ListBoxItem>2</ListBoxItem>       <ListBoxItem>3</ListBoxItem>       <ListBoxItem>4</ListBoxItem>       <ListBoxItem>5</ListBoxItem>       <ListBoxItem>6</ListBoxItem>       <ListBoxItem>7</ListBoxItem>       <ListBoxItem>8</ListBoxItem>       <ListBoxItem>9</ListBoxItem>     </ListBox>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">       <Button MinWidth="75" Margin="10">Help</Button>       <Button MinWidth="75" Margin="10">OK</Button>     </StackPanel>     <StatusBar>test</StatusBar>   </StackPanel> </Window> //File:Window.xaml.vb Imports System.Windows Imports System.Windows.Controls Public Partial Class AboutDialog   Inherits Window   Public Sub New()     InitializeComponent()   End Sub   Private Sub ListBox_SelectionChanged(sender As Object, e As SelectionChangedEventArgs)     If e.AddedItems.Count > 0 Then       MessageBox.Show("You just selected " & Convert.ToString(e.AddedItems(0)))     End If   End Sub   Private Sub Button_Click(sender As Object, e As RoutedEventArgs)     MessageBox.Show("You just clicked " & Convert.ToString(e.Source))   End Sub End Class