Asp.Net MVC and Report Viewer Control

public ActionResult GetActiveRecordReports()

        {

            List<PE_getActiveCaseListResult> myResult = new List<PE_getActiveCaseListResult>();

            try

            {

                // myResult = (List<PE_getActiveCaseListResult>)Session["GETACTIVEREPORTDATA"];

                myResult = (List<PE_getActiveCaseListResult>)WebserviceHelper.GetReportData("GETACTIVEREPORTDATA"); //List

                CasesModel model = new CasesModel();

                LocalReport localReport = new LocalReport();

                localReport.ReportPath = Server.MapPath("~/Reports/ActiveCaseReport.rdlc"); //Report Path

                String[] dateFrom = Request.QueryString[1].ToString().Split('K'); //Date

                String[] dateTo = Request.QueryString[2].ToString().Split('K');

                DateTime DateBegin = new DateTime(Convert.ToInt32(dateFrom[2]), Convert.ToInt32(dateFrom[0]), Convert.ToInt32(dateFrom[1]));

                DateTime DateEnd = new DateTime(Convert.ToInt32(dateTo[2]), Convert.ToInt32(dateTo[0]), Convert.ToInt32(dateTo[1]));

                string FileType = Request.QueryString[3].ToString();// File Type "PDF,Excel,TIF

                ReportDataSource reportDataSource = new ReportDataSource("AciveDataSet", myResult); //Dateset

                ReportParameter pFrom = new ReportParameter("DateFrom", DateBegin.ToString("MM/dd/yyyy")); //Parameter

                ReportParameter pTo = new ReportParameter("DateTo", DateEnd.ToString("MM/dd/yyyy"));

                localReport.SetParameters(new ReportParameter[] { pFrom, pTo });

                localReport.DataSources.Add(reportDataSource);

                string reportType = FileType;

                string mimeType;

                string encoding;

                string fileNameExtension;

                string deviceInfo = string.Empty;

                Warning[] warnings;

                string[] streams;

                byte[] renderedBytes;

                //The DeviceInfo settings should be changed based on the reportType

                //http://msdn2.microsoft.com/en-us/library/ms155397.aspx

                //Render the report

                renderedBytes = localReport.Render(

                    reportType,

                    null,

                    out mimeType,

                    out encoding,

                    out fileNameExtension,

                    out streams,

                    out warnings);

                Response.AddHeader("content-disposition", "attachment; filename=ActiveCaseReport." + fileNameExtension);

                return File(renderedBytes, mimeType);

            }

            catch (Exception ex)

            {

                employment.CommonClasses.PeErrorLog.InsertErrorLog("User Name:-" + employment.CommonClasses.ControlHelper.GetPeSessionUserName(),

                                                                "GetActiveRecordReports():- " + ex.Message.ToString(), " Address:-" + Request.Path);

            }

            return null;

        }