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    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="PreventSessionEnd" Height="300" Width="300"
    >
    
      Throw an Unhandled Exception
    

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace PreventSessionEnd
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void cmdException_Click(object sender, RoutedEventArgs e)
        {
            throw new ApplicationException("You clicked a bad button.");                
        }
    }
}