Crystal Reports how to send dropdowns selected value to crystal report page using mvc

public ActionResult PatronBarGraph(FormCollection Form)
        {
            string patrontype = Form["patrontype"];
            string location = Form["LocationId"];
            string category = Form["CategoryId"];
            string ReportTypeTitle = string.Empty;

            string reportName = string.Empty;

            int locationId = Convert.ToInt32(location);
            int categoryId = (string.IsNullOrEmpty(category)) ? 0 : Convert.ToInt32(category);

            if (patrontype.Equals("ActivePatronsByRace"))
            {
                reportName = "PatronBarGraphByLC";
                ReportTypeTitle = "Active Patrons by Race Count";
            }

            else if (patrontype.Equals("InActivePatronsByRace"))
            {
                reportName = "PatronBarGraphByLC";
                ReportTypeTitle = "InActive Patrons by Race Count";
            }

            var rpt = new Services.Report.ReportService(reportName, null);
            var service = new PatronService(DataContext);

            if (patrontype.Equals("ActivePatronsByRace"))
            {
                rpt.ReportDocument.SetDataSource(service.GetRaceCountOfActivePatrons(locationId,categoryId));

            }
            else if (patrontype.Equals("InActivePatronsByRace"))
            {
                rpt.ReportDocument.SetDataSource(service.GetRaceCountOfInActivePatrons(locationId, categoryId));
            }

            rpt.ReportDocument.SummaryInfo.ReportTitle = string.Format("Bar Chart Report for {0}", ReportTypeTitle);
            return ReturnPDF(rpt.GetPDFStream(), reportName);

        }