WPF VB.Net

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:system="clr-namespace:System.Windows;assembly=PresentationFramework"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Main Window" Height="310" Width="280" Closing="Window1_Closing">

//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents
Imports System.Windows.Media
Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub
    Private Sub Window1_Closing(sender As Object, e As CancelEventArgs)
      Application.Current.Shutdown()
    End Sub
  End Class
End Namespace