public ActionResult Edit(TimeSlot timeslot)
        {
            if (ModelState.IsValid)
            {
                db.Entry(timeslot).State = EntityState.Modified;
                db.SaveChanges();
                return PartialView("GridData", new TimeSlot[] { timeslot });
            }

            return PartialView(timeslot);
        }
        public ActionResult Create(TimeSlot timeslot)
        {
            if (ModelState.IsValid)
            {
                db.TimeSlots.Add(timeslot);
                db.SaveChanges();
                return PartialView("GridData", new TimeSlot[] { timeslot });
            }

            return PartialView("Edit", timeslot);
        }