public ActionResult Index()
        {
            TBL_USERSservices _services = new TBL_USERSservices();
            TBL_USERS user = _services.GetUserByUsername(User.Identity.Name);
            ViewBag.userTimeZone = user.user_timezone.ToString();

            TBL_USER_MANAGEMENTservices _managementServices = new TBL_USER_MANAGEMENTservices();
            List<string> list = _managementServices.GetUserManagements(User.Identity.Name);
            //System.Diagnostics.Debug.Write("list count: " + list.Count + "/n");
            return View(list);
        }
        public List<string> GetUserManagements(string ownerName)
        {
            TBL_USERSservices userServices = new TBL_USERSservices();
            TBL_USERS owner = userServices.GetUserByUsername(ownerName);
            //var res =  _userMangement.Collection.AsQueryable<TBL_USER_MANAGEMENT>()
            //           .Where (c => c.manager_row_id == owner._id)
            //           .Select(c => c);
            List<TBL_USER_MANAGEMENT> res = GetUsersUnderManagement(owner._id);
            TBL_USER_MANAGEMENT item = res[0];
            List<string> list = new List<string>();

            list.Add("owner: " + owner.user_name + " count: " + res.Count);
            List<ObjectId> llist = getUsersListUnderManagement(owner._id);

            if (list.Count > 0)
            {
                foreach (var llistItem in llist)
                {
                    list.Add(llistItem.ToString());
                    if (userServices.GetUserByObjectIdAsString(llistItem.ToString()) != null)
                    {
                        list.Add(userServices.GetUserByObjectIdAsString(llistItem.ToString()).user_name);
                    }
                    else
                    {
                        list.Add("=====");
                    }
                    //TBL_USERS user = userServices.GetUser(owner._id);
                    //list.Add(user.user_name);
                }
            }

            //list.Add(userServices.GetUser(item.user_row_id).user_name);
            //foreach (var item in res)
            //{
            //    //ObjectId userId = item.user_row_id;
            //    //TBL_USERS user = userServices.GetUser(userId);
            //    //string name = user.user_name;
            //    list.Add(userServices.GetUser(item.user_row_id).user_name);
            //    //list.Add(item._id + " \n " + item.manager_row_id + "\n " + item.user_row_id);
            //    //TBL_USERS user = userServices.GetUser(item.user_row_id);
            //    //System.Diagnostics.Debug.Write("-------------username: "******"----" + item.user_row_id + "-------------------\n");
            //}

            //TBL_USERS user = userServices.GetUser(owner._id);
            //System.Diagnostics.Debug.Write("-------------username: "******"-----------------------\n");

            return list;
        }