public List <AreaViewModel> GetAreaChilds(string parentId)
        {
            using (var dbContext = new DuPont_TestContext())
            {
                var areaList = dbContext.GET_AREA_CHILDS(parentId);
                var result   = from m in areaList
                               orderby m.AID
                               select new AreaViewModel
                {
                    AID         = m.AID,
                    DisplayName = m.DisplayName
                };

                return(result.ToList());
            }
        }