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

        public void ClearUserRoles(string userId)
        {
            var um = new UserManager<ApplicationUser>(
                new UserStore<ApplicationUser>(new ApplicationDbContext()));
            var user = um.FindById(userId);
            var currentRoles = new List<IdentityUserRole>();
            currentRoles.AddRange(user.Roles);
            foreach (var role in currentRoles)
            {
                um.RemoveFromRole(userId, role.Role.Name);
            }
        }

 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();
 }