public JsonResult GetDiagnosis(string name) { var getdiagnosisModel = new List <GenericListModel>(); getdiagnosisModel = string.IsNullOrEmpty(name) ? _clPatientStatisticsDB.GetDiagnosis(null) : _clPatientStatisticsDB.GetDiagnosis(name); getdiagnosisModel.Add(new GenericListModel { id = 0, name = "ALL", text = "ALL" }); var json = getdiagnosisModel.DefaultIfEmpty(); return(Json(json, JsonRequestBehavior.AllowGet)); }