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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.cs using System.Windows; using System.Windows.Controls; public partial class AboutDialog : Window {     public AboutDialog()     {         InitializeComponent();     }     void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)     {         if (e.AddedItems.Count > 0)             MessageBox.Show("You just selected " + e.AddedItems[0]);     }     void Button_Click(object sender, RoutedEventArgs e)     {         MessageBox.Show("You just clicked " + e.Source);     } }