public ActionResult get_Cancellation_Stats(string fdate, string tdate,
                                                   string sertype, string station, string billtype, string chargeby, string reason, int recfilter)
        {
            PatientStatisticsDB   _DB = new PatientStatisticsDB();
            List <CANResultModel> _RE = _DB.get_Cancellation_Stats(fdate, tdate, sertype, station, billtype, chargeby, reason, recfilter);
            var serializer            = new JavaScriptSerializer {
                MaxJsonLength = Int32.MaxValue
            };
            var result = new ContentResult
            {
                Content     = serializer.Serialize(new { Res = _RE ?? new List <CANResultModel>() }),
                ContentType = "application/json"
            };

            return(result);
        }