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();
}