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Cross Thread Exception Raising

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="WpfApplication1.SecondaryUiThreadWindow"   Height="200" Width="400" Closed="SecondaryUiThreadWindow_Closed">   <Button Click="r">Raise an Exception on the Secondary UI Thread</Button> </Window> //File:Window.xaml.cs using System;  using System.Threading; using System.Windows;  using System.Windows.Threading; namespace WpfApplication1 {     public partial class SecondaryUiThreadWindow : Window     {         public SecondaryUiThreadWindow()         {             InitializeComponent();             this.Title = Thread.CurrentThread.ManagedThreadId+"";         }         void r(object sender, RoutedEventArgs e)         {             throw new Exception(Dispatcher.CurrentDispatcher.Thread.ManagedThreadId+"");         }         void SecondaryUiThreadWindow_Closed(object sender, EventArgs e)         {             Dispatcher.CurrentDispatcher.InvokeShutdown();         }     } }