private void menuSubject_Click(object sender, RoutedEventArgs e)
 {
     Subject.NewSubject objSubject = new Subject.NewSubject();
     Close();
     objSubject.Show();
 }
 private void menuSubject_Click(object sender, RoutedEventArgs e)
 {
     Subject.NewSubject objSubject = new Subject.NewSubject();
     Close();
     objSubject.Show();
 }