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Manage unhandled exceptions that are thrown on secondary user interface (UI) threads

<Application   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="WpfApplication1.App"   StartupUri="MainWindow.xaml"    DispatcherUnhandledException="App_DispatcherUnhandledException" /> //File:Window.xaml.cs using System;  using System.Text;  using System.Windows; using System.Windows.Threading;  namespace WpfApplication1 {     public partial class App : Application     {         void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)         {             StringBuilder sb = new StringBuilder();             sb.AppendFormat("{0}\n", e.Exception.InnerException.Message);             sb.AppendFormat("{0}\n", e.Exception.Message);             sb.AppendFormat("Exception handled on main UI thread {0}.", e.Dispatcher.Thread.ManagedThreadId);             MessageBox.Show(sb.ToString());             e.Handled = true;         }     } }