Crystal Report not displaying data in MVC

Hi There

I have created a report whereby i then call it via the controller when i click the httpost event i then generate my pdf download link but when i open the report no data is showing. 

I have created parameter fields and want to link the strings within my controller to send data through to the report

Are there any resolutions or can't i do it that way?

var reportPath = Server.MapPath("~/ReportTemplates/PaymentCertificate.rpt");

            var customers = _db.Projects;


             ReportClass rptH = new ReportClass();
            rptH.FileName = Server.MapPath("~/ReportTemplates/PaymentCertificate.rpt");
            rptH.Load();
            rptH.SetDataSource(customers);
             Stream stream = rptH.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
            return File(stream, "application/pdf");

            using (var reportDocument = new ReportDocument())
            {

                reportDocument.Load(reportPath);



                reportDocument.SetDataSource(students);

                var response = System.Web.HttpContext.Current.Response;
                reportDocument.SetParameterValue("ProjectName", Project);

                reportDocument.ExportToHttpResponse(ExportFormatType.PortableDocFormat, response, true, "PaymentCertificate");


            }

            return new EmptyResult();

PLEASE HELP !!!