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Unblock Thread with Dispatcher BeginInvoke

<Window x:Class="WPFThreading.UnblockThread"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="UI Thread Blocker" Height="275" Width="225">     <StackPanel>       <Button Name="button1" Click="button1_click">Go to sleep</Button>       <Button Name="button2" Click="button2_click">Try Me</Button>       <TextBox Name="textbox1"/>       <Label Name="UIThreadLabel"></Label>       <Label Name="BackgroundThreadLabel"></Label>     </StackPanel> </Window> //File:Window.xaml.cs using System.Windows; using System.Windows.Threading; using System.Threading; namespace WPFThreading {   public partial class UnblockThread : System.Windows.Window   {     private delegate void SimpleDelegate();     public UnblockThread()     {       InitializeComponent();       this.UIThreadLabel.Content = this.Dispatcher.Thread.ManagedThreadId;       this.BackgroundThreadLabel.Content = "N/A";     }     private void LongRunningProcess()      {       SimpleDelegate del1 = delegate(){ this.BackgroundThreadLabel.Content = Thread.CurrentThread.ManagedThreadId; };       this.Dispatcher.BeginInvoke(DispatcherPriority.Send, del1);       Thread.Sleep(5000);       SimpleDelegate del2 = delegate() {this.textbox1.Text = "Done Sleeping...";};       this.Dispatcher.BeginInvoke(DispatcherPriority.Send, del2);     }     private void button1_click(object sender, RoutedEventArgs e)     {       SimpleDelegate del = new SimpleDelegate(LongRunningProcess);       del.BeginInvoke(null, null);     }     private void button2_click(object sender, RoutedEventArgs e)     {       this.textbox1.Text = "Hello WPF";     }   } }