ถ้ารัน Crystal Report บน Server จำเป็นต้องติดตั้ง Crystal Report ไหมคับ

bill_id = Request.QueryString["bill_id"].ToString();
WebApplication1.App_Data.DataSet1TableAdapters.billReportTableAdapter BillReport = new WebApplication1.App_Data.DataSet1TableAdapters.billReportTableAdapter();
DataTable dtBill = BillReport.GetDataBillReport(bill_id);

String path = ConfigurationManager.AppSettings["REPORT_TEMP"].ToString();
String fileName = String.Format("{0}{1}.pdf", path, Guid.NewGuid().ToString());
String reportLocation = Server.MapPath("BillReport.rpt");
CrystalReportSource1.ReportDocument.Load(reportLocation);
CrystalReportSource1.ReportDocument.SetDataSource(dtBill);
CrystalReportSource1.ReportDocument.PrintOptions.PaperSize = PaperSize.PaperA4;
CrystalReportSource1.DataBind();
CrystalReportSource1.ReportDocument.ExportToDisk(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat, fileName);

Response.Clear();
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "inline; filename=payreqinst.pdf");
Response.WriteFile(fileName);
Response.Flush();
Response.Close();
System.IO.File.Delete(fileName);