AspNetEmailExample.Models.IdentityManager.AddUserToRole C# (CSharp) Метод

        public bool AddUserToRole(string userId, string roleName)
        {
            var um = new UserManager<ApplicationUser>(
                new UserStore<ApplicationUser>(new ApplicationDbContext()));
            var idResult = um.AddToRole(userId, roleName);
            return idResult.Succeeded;
        }

 public ActionResult UserRoles(SelectUserRolesViewModel model)
 {
     if (ModelState.IsValid)
     {
         var idManager = new IdentityManager();
         var Db = new ApplicationDbContext();
         var user = Db.Users.First(u => u.UserName == model.UserName);
         idManager.ClearUserRoles(user.Id);
         foreach (var role in model.Roles)
         {
             if (role.Selected)
             {
                 idManager.AddUserToRole(user.Id, role.RoleName);
             }
         }
         return RedirectToAction("index");
     }
     return View();
 }