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Application NavigationFailed event

<Application x:Class="NavigationApplication.App"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     StartupUri="StartupWindow.xaml" NavigationFailed="App_NavigationFailed"> </Application> //File:Window.xaml.cs using System; using System.Windows; using System.Data; using System.Xml; using System.Configuration; using System.Windows.Threading; using System.Windows.Navigation; namespace NavigationApplication {     public partial class App : System.Windows.Application     {         private void App_NavigationFailed(object sender, NavigationFailedEventArgs e)         {             if (e.Exception is System.Net.WebException)             {                                 MessageBox.Show("Website " + e.Uri.ToString() + " cannot be reached.");                 e.Handled = true;                             }         }          } }