public JsonResult GetPIN(string doctorid, string fromdate, string todate) { //if (String.IsNullOrEmpty(doctorid)) return null; var getpinModel = new List <GenericListModel>(); getpinModel = !string.IsNullOrEmpty(doctorid) ? _clPatientStatisticsDB.GetPIN(int.Parse(doctorid), fromdate, todate) : getpinModel; getpinModel.Add(new GenericListModel { id = 0, name = "ALL", text = "ALL" }); var json = getpinModel.DefaultIfEmpty(); return(Json(json, JsonRequestBehavior.AllowGet)); }