public string GetExam(int id) { ResultObject resultt = new ResultObject(); try { resultt.Data = services.GetDetailExams(id); return(JsonConvert.SerializeObject(resultt, Formatting.Indented, new JsonSerializerSettings { ReferenceLoopHandling = ReferenceLoopHandling.Ignore })); } catch (Exception e) { resultt.Message = "EXCEPTION: " + e.Message + "Stack: " + e.StackTrace; return(JsonConvert.SerializeObject(resultt)); } }