public IActionResult Register(RegisterViewModel rvm)
        {
            _studentRepo.AddStudentCourses(rvm.StudentId, rvm.courseIds);



            return(RedirectToAction("Result", "School", new
            {
                studentid = rvm.StudentId
            }));
            //var a = _studentRepo.GetStudentCourseById(rvm.StudentId);
            //if (a == null)
            //{
            //    _studentRepo.AddStudentCourses(rvm.StudentId, rvm.courseIds);
            //    return View();
            //}
            //else
            //{
            //    return Json(new { success = false, message = "already registered" });
            //}
        }