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WPF Threading

<Window x:Class="WPFThreading.BlockThread"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="UI Thread Blocker" Height="300" Width="250">     <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 Name="BackgroundThreadLabel"/>     </StackPanel> </Window> //File:Window.xaml.cs using System.Windows; namespace WPFThreading {   public partial class BlockThread : System.Windows.Window   {     public BlockThread()     {       InitializeComponent();       this.UIThreadLabel.Content = this.Dispatcher.Thread.ManagedThreadId;       this.BackgroundThreadLabel.Content = "N/A";     }     private void button1_click(object sender, RoutedEventArgs e)     {       System.Threading.Thread.Sleep(5000);       this.textbox1.Text = "Done Sleeping...";     }     private void button2_click(object sender, RoutedEventArgs e)     {       this.textbox1.Text = "Hello WPF";     }   } }