public ActionResult Register(PersonModel model)
        {
            if (!ModelState.IsValid)
            {
                return(View(model));
            }

            AppRepository repo = new Repository.AppRepository();

            if (repo.UserAlreadyExists(model.User_Id))
            {
                ModelState.AddModelError("", "User Already Exists!");
                return(View(model));
            }
            try
            {
                if (repo.RegisterOrUpdateUser(model))
                {
                    ViewBag.Message = "User created Successfully! Please Log in to continue....";
                }
                else
                {
                    ViewBag.Message = "";
                    ModelState.AddModelError("", "Unable to create user now. Please try again later!");
                }
            }
            catch (Exception ex)
            {
                ModelState.AddModelError("", "Unable to create user now. Please try again later!");
            }
            return(View(model));
        }
        public ActionResult Login(LoginModel model)
        {
            if (!ModelState.IsValid)
            {
                return(View(model));
            }

            AppRepository repo   = new Repository.AppRepository();
            Person        person = repo.AuthenticateUser(model.UserName, model.Password);

            if (person != null)
            {
                FormsAuthentication.SetAuthCookie(model.UserName, true);
                Session["UserName"] = model.UserName;
                return(RedirectToAction("Index", "Home"));
            }
            else
            {
                ModelState.AddModelError("", "Invalid Username or Password!");
                return(View(model));
            }
        }