c# - export as a pdf file using crystal report

Question

I have code sample here, I can save as a PDF file directly but what I want to do is to show client first pdf file, and allow users to save it. How do I achieve this?

ReportDocument rpt = new ReportDocument();
rpt.Load(@"C:CrystalReport2.rpt");

rpt.SetDataSource(datatablesource);

ExportOptions rptExportOption;
DiskFileDestinationOptions rptFileDestOption = new DiskFileDestinationOptions();
PdfRtfWordFormatOptions rptFormatOption = new PdfRtfWordFormatOptions();
string reportFileName = @"C:SampleReport.pdf";
rptFileDestOption.DiskFileName = reportFileName;
rptExportOption = rpt.ExportOptions;
{
    rptExportOption.ExportDestinationType = ExportDestinationType.DiskFile;
    //if we want to generate the report as PDF, change the ExportFormatType as "ExportFormatType.PortableDocFormat"
    //if we want to generate the report as Excel, change the ExportFormatType as "ExportFormatType.Excel"
    rptExportOption.ExportFormatType = ExportFormatType.PortableDocFormat;
    rptExportOption.ExportDestinationOptions = rptFileDestOption;
    rptExportOption.ExportFormatOptions = rptFormatOption;
}

rpt.Export();

Answer 1

Here is my code:

dbObj = new ConnectDB();
query = "SELECT Student.*, School.*FROM Student where admissionnumber = '" + reg_number + "'";
DataSet ds = dbObj.Fetch_Data(query, "DataView");
ReportDocument rd;
rd = new ReportDocument();
rd.Load(Application.StartupPath + "\StudentReg.rpt");
//rd.Load("StudentReg.rpt");
rd.SetDataSource(ds);
crv.ReportSource = rd;
crv.Refresh();
if(File.Exists(@"D:" + reg_number + ".pdf"))
    File.Delete(@"D:" + reg_number + ".pdf");
rd.ExportToDisk(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat, @"D:" + reg_number + ".pdf");