public ActionResult Create(UserAdd model)
 {
     if (ModelState.IsValid)
     {
         callCenterRepo = new CallcenterRepo(context, HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>(), HttpContext.GetOwinContext().Get<ApplicationSignInManager>());
         callCenterRepo.Create(model);
         return RedirectToAction("Index");
     }
     return View(model);
 }
 // Danh sach Callcenter
 public ActionResult Index()
 {
     callCenterRepo = new CallcenterRepo();
     return View();
 }