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Raise exception from button click event

<Window x: Class="DispatcherUnhandledExceptionSample.MainWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="DispatcherUnhandledException Sample" Height="300" Width="300">   <StackPanel>     <Button Name="raiseRecoverableException" Click="raiseRecoverableException_Click">Raise Recoverable Exception</Button>     <Button Name="raiseUnrecoverableException" Click="raiseUnecoverableException_Click">Raise Unrecoverable Exception</Button>   </StackPanel> </Window> //File:MainWindow.xaml.vb Imports System Imports System.Windows Namespace DispatcherUnhandledExceptionSample   Public Partial Class MainWindow     Inherits Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub raiseRecoverableException_Click(sender As Object, e As RoutedEventArgs)       Throw New DivideByZeroException("Recoverable Exception")     End Sub     Private Sub raiseUnecoverableException_Click(sender As Object, e As RoutedEventArgs)       Throw New ArgumentNullException("Unrecoverable Exception")     End Sub   End Class End Namespace