public static string edit_ItemJsonString(string item_json, string msg_default = "")
        {
            string json = msg_default;

            try
            {
                m_canhbao_cauhinh m = JsonConvert.DeserializeObject <m_canhbao_cauhinh>(item_json);

                int index = list.FindIndex(o => o.cauhinh_id == m.cauhinh_id);
                if (index != -1)
                {
                    m_canhbao_cauhinh o = list[index];

                    o.name = m.name;
                    o.note = m.note;

                    lock (list)
                        list[index] = o;

                    update();

                    json = JsonConvert.SerializeObject(o);
                }
            }
            catch { }

            return(json);
        }
        public static Tuple <bool, string, dynamic> edit(string s_key, string s_item)
        {
            try
            {
                string json = "";

                var m = JsonConvert.DeserializeObject <m_canhbao_cauhinh>(s_item);

                int index = list.FindIndex(o => o.cauhinh_id == m.cauhinh_id);
                if (index != -1)
                {
                    m_canhbao_cauhinh o = list[index];

                    o.name = m.name;
                    o.note = m.note;

                    lock (list) list[index] = o;

                    update();

                    json = JsonConvert.SerializeObject(o);
                }

                return(new Tuple <bool, string, dynamic>(true, json, m));
            }

            catch { }
            return(new Tuple <bool, string, dynamic>(false, "", null));
        }
        public static string get_ItemJsonBy_find_name(string name, string msg_default = "")
        {
            string json = msg_default;

            var ls = list.Where(x => x.name == name).ToList();

            for (int k = 0; k < ls.Count; k++)
            {
                m_canhbao_cauhinh m = ls[k];
                ls[k] = m;
            }

            json = JsonConvert.SerializeObject(ls);
            return(json);
        }