public Hashtable Get(int page, int limit, int group_id, string worker_name, int worker_id)
        {
            Hashtable  ht   = new Hashtable();
            Hashtable  data = new Hashtable();
            RewardInfo ai   = new RewardInfo();

            ht.Add("code", 20000);
            data.Add("items", Hashtables(ai.GetRewardInfo((page - 1) * limit, limit, group_id)));
            data.Add("total", ai.GetSize(group_id));
            ht.Add("data", data);
            return(ht);
        }