Throw Handled Exception

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<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="135" Width="300">
  <StackPanel>
    <Button x:Name="btnThrowHandledException" Click="btnThrowHandledException_Click" Content="Throw Handled Exception" Margin="10,10,10,5" />
  </StackPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.ComponentModel;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void btnThrowHandledException_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                throw new NotImplementedException();
            }
            catch (NotImplementedException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}