public ActionResult Change(string oap_patient, string oap_dept, string odate, string ap_patient, string ap_dept, string date)
        {
            DateTime           oda = DateTime.Parse(odate);
            DateTime           da  = DateTime.Parse(date);
            AppointmentService pa  = new AppointmentService();
            var res = pa.Change(oap_patient, oap_dept, oda, ap_patient, ap_dept, da);

            //return RedirectToAction(nameof(Index));
            return(Json(res, JsonRequestBehavior.AllowGet));
        }