public static List <GetQAnswer> GetQAnswerID(string t_id, string q_id) { listGetQAnswer.Clear(); wcf.parti.Service1 _parti = new wcf.parti.Service1(); partiDB.RootObject rootObject = new partiDB.RootObject(); if (listGetQAnswer.Count == 0) { string json_str = _parti.GetQAnswer(t_id, q_id); if (json_str == "e0")//code error { MessageBox.swalModal(_Page, "error", "e0:ລະບົບຂັດຂ້ອງຕິດຕໍ່ຜູ້ເບີ່ງແຍ່ງດ່ວນ.", ""); } else if (json_str == "e1")//no data found { MessageBox.swalModal(_Page, "info", "e1:ບໍ່ມີຂໍ້ມູນທີ່ຈະສະແດງ.", ""); } else if (json_str == "e2")//can't connect databbase { MessageBox.swalModal(_Page, "warning", "e2:ບໍ່ສາມາດເຊື່ອມຕໍ່ຖານຂໍ້ມູນໄດ້.", ""); } else { var i = 1; rootObject = JsonConvert.DeserializeObject <partiDB.RootObject>(json_str); foreach (var vl in rootObject.GetQAnswer) { listGetQAnswer.Add(new GetQAnswer(vl.a_id, vl.answer_text, vl.q_id, vl.t_id, vl.status, vl.date_of_modified_date)); } } } return(listGetQAnswer); }