public ActionResult RejectRegistration(int id)
        {
            var user = DB.Account.Single(x => x.Id == id);

            user.EnabledEnum = UserStatus.Blocked;
            DB.SaveChanges();
            Mails.RegistrationReject(user, Request.Form["reject-reason"]);
            SuccessMessage("Сохранено");
            return(RedirectToAction("Index"));
        }