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Load the Items in a ListBox Asynchronously

<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="200" Width="300"     Loaded="Window_Loaded">     <Window.Resources>         <DataTemplate x:Key="ListItemTemplate">             <StackPanel Orientation="Horizontal">                 <TextBlock Text="{Binding}" VerticalAlignment="Center"/>             </StackPanel>         </DataTemplate>     </Window.Resources>     <StackPanel>         <ListBox x:Name="listBox" ItemTemplate= "{StaticResource ListItemTemplate}"/>     </StackPanel> </Window> //File:Window.xaml.cs using System.Collections.ObjectModel; using System.Windows; using System.Windows.Threading; namespace WpfApplication1 {     public partial class Window1 : Window     {         private ObservableCollection<string> numberDescriptions;         public Window1()         {             InitializeComponent();         }         private void Window_Loaded(object sender, RoutedEventArgs e)         {             numberDescriptions = new ObservableCollection<string>();             listBox.ItemsSource = numberDescriptions;             this.Dispatcher.BeginInvoke(DispatcherPriority.Background,new LoadNumberDelegate(LoadNumber), 1);         }         private delegate void LoadNumberDelegate(int number);         private void LoadNumber(int number)         {             numberDescriptions.Add("Number " + number.ToString());             this.Dispatcher.BeginInvoke(DispatcherPriority.Background,new LoadNumberDelegate(LoadNumber), ++number);         }     } }