private void StudentEmailAddressLecturer_FormClosed(object sender, FormClosedEventArgs e)
        {
            this.Close();
            MenuLecturer l = (MenuLecturer)this.Owner;

            l.Show();
        }
        private void AttendanceListLecturer_FormClosed(object sender, FormClosedEventArgs e)
        {
            this.Close();
            MenuLecturer l = (MenuLecturer)this.Owner;

            l.Show();
        }