public JsonResult Exam_Schedule(Exam_Schedule rec)
        {
            ExamScheduleservices services = new ExamScheduleservices();
            services.Exam_Schedule(rec);
            var sub_list = db.Subjects.ToList();
            ViewBag.sb = sub_list;
            var sec_list = db.Sections.ToList();
            ViewBag.sc = sec_list;
            var cal_list = db.Classes.ToList();
            ViewBag.cl = cal_list;



            return Json(new { msg = "save" }, JsonRequestBehavior.AllowGet);
        }
 // GET: StudentServices
 public void Exam_Schedule(Exam_Schedule rec)
 {
     db.Exam_Schedules.Add(rec);
     db.SaveChanges();
 }