public ActionResult Create(Doctor doctor)
        {
            if (ModelState.IsValid)
            {
                _db.Doctors.Add(doctor);
                _db.SaveChanges();
                return RedirectToAction("IndexList");
            }

            return View(doctor);
        }
 public ActionResult Edit(Doctor doctor)
 {
     if (ModelState.IsValid)
     {
         _db.Entry(doctor).State = EntityState.Modified;
         Doctor doc= _db.Doctors.Find(doctor.DoctorId);
         doc = doctor;
         _db.SaveChanges();
         return RedirectToAction("IndexList");
     }
     return View(doctor);
 }