public JsonResult Active(int?id)
        {
            var dao = new UsersDAO();

            if (dao.Active(id))
            {
                List <User>   users = db.Users.Where(n => n.user_bin == false).OrderBy(n => n.user_name).ToList();
                List <jUsers> list  = users.Select(n => new jUsers
                {
                    user_active     = n.user_active,
                    user_bin        = n.user_bin,
                    user_code       = n.user_code,
                    user_datecreate = n.user_datecreate.Value.ToString("dd/MM/yyyy"),
                    user_datelogin  = n.user_datelogin.Value.ToString("dd/MM/yyyy"),
                    user_deadline   = n.user_deadline.Value.ToString("dd/MM/yyyy"),
                    user_email      = n.user_email,
                    user_id         = n.user_id,
                    user_img        = n.user_img,
                    user_name       = n.user_name,
                    user_option     = n.user_option,
                    user_pass       = n.user_pass,
                    user_point      = n.user_point,
                    user_token      = n.user_token
                }).ToList();
                return(Json(list, JsonRequestBehavior.AllowGet));
            }
            else
            {
                return(Json(null));
            }
        }