public static TamGiac DocTamGiac()

        {

            string fileName = "D:\\KTLT\\KTLT_2022_12\\KTLT_2022_12\\TamGiac.json";

            string fileContent = File.ReadAllText(fileName);

            TamGiac tg = JsonConvert.DeserializeObject<TamGiac>(fileContent);

            return tg;

        }