public JsonResult GetRoleRecord(string prefix)
        {
            DataSet role = new DataSet();

            role = user.GetRole(prefix);
            List <Users> search = new List <Users>();

            foreach (DataRow dr in role.Tables[0].Rows)
            {
                search.Add(new Users
                {
                    RoleID   = Convert.ToInt32(dr["RoleID"]),
                    RoleName = dr["RoleName"].ToString(),
                });
            }
            return(new JsonResult {
                Data = search, JsonRequestBehavior = JsonRequestBehavior.AllowGet
            });
        }