public ActionResult Edit(Doctor doctor)
        {
            if(ModelState.IsValid)
            {
                db.Entry(doctor).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.IDCity = new SelectList(db.Cities, "IDCity", "Name", doctor.IDCity);
            ViewBag.IDSpecialty = new SelectList(db.Specialties, "IDSpecialty", "Name", doctor.IDSpecialty);

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

            ViewBag.IDCity = new SelectList(db.Cities, "IDCity", "Name");
            ViewBag.IDSpecialty = new SelectList(db.Specialties, "IDSpecialty", "Name");

            return View(doctor);
        }