Handle Application DispatcherUnhandledException

   
  
<Application x:Class="TreeViewDataBinding.app"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Startup="AppStartup"
    >
    <Application.Resources>
         
    </Application.Resources>
</Application>


//File:Window.xaml.cs

using System;
using System.Windows;
using System.Data;
using System.Xml;
using System.Configuration;

namespace TreeViewDataBinding
{
    public partial class app : Application
    {

        void AppStartup(object sender, StartupEventArgs args)
        {
            this.DispatcherUnhandledException += new System.Windows.Threading.DispatcherUnhandledExceptionEventHandler(app_DispatcherUnhandledException);
        }

        void app_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
        {
            MessageBox.Show(e.Exception.Message);
        }
        
       

    }
}