private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            this.Hide();
            Member_Login f = new Member_Login();

            f.Show();
        }
        private void button5_Click(object sender, EventArgs e)
        {
            this.Hide();
            Application.Exit();
            Member_Login member = new Member_Login();

            member.Hide();
            MainWindow main = new MainWindow();

            main.Show();
        }