Right way to close WPF GUI application: GetCurrentProcess().Kill(), Environment.Exit(0) or this.Shutdown()

Question

My GUI desktop-based WPF 4.0 (C# .Net 4.0) program works with SQL Server database. Each time when I run my application it creates a connection to SQL Server via ADO.NET Enti

Answer 1

private void ExitMenu_Click(object sender, RoutedEventArgs e)
    {
        Application.Current.Shutdown();
    }