Application Exit event
<Application x:Class="SimpleXamlApp.MyApp" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="MainWindow.xaml" Exit ="AppExit"> <x:Code> private void AppExit(object sender, ExitEventArgs e) { MessageBox.Show("App has exited"); } </x:Code> </Application>