public CategoryItems Get(object key)
        {
            int           id   = Convert.ToInt32(key);
            CategoryItems item = new CategoryItems()
            {
                Id = id
            };
            string  sql = item.GetFirstOneSql();
            DataSet ds  = new SqlCmdHelper()
            {
                SqlConnString = SqlConnString
            }.GenerateQuerySqlAndExcute(sql, item);
            List <CategoryItems> data = DataHelp.DataReflection.DataSetConvert <CategoryItems>(ds);

            if (data == null || data.Count == 0)
            {
                return(null);
            }
            return(data[0]);
        }