public static List <GetTrainerByTraining> GetTrainerByTrainings(string id) { TrainerByTrainings.Clear(); wcf.parti.Service1 _parti = new wcf.parti.Service1(); partiDB.RootObject rootObject = new partiDB.RootObject(); string json_str = _parti.GetTrainerByTraining(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 { int i = 1; rootObject = JsonConvert.DeserializeObject <partiDB.RootObject>(json_str); foreach (var vl in rootObject.GetTrainerByTraining) { TrainerByTrainings.Add(new GetTrainerByTraining(vl.training_id, vl.trainer_id, vl.fullname, vl.work_place)); i++; } } return(TrainerByTrainings); }