Programmatically create a PDF in my .NET application

using CrystalDecisions.CrystalReports.Engine;

ReportDocument rptCust;
string sDate_time;
string sDestination_path;

CrystalDecisions.Shared.ExportOptions myExportOptions;
CrystalDecisions.Shared.DiskFileDestinationOptions File_destination;
CrystalDecisions.Shared.PdfRtfWordFormatOptions Format_options;

myExportOptions = new CrystalDecisions.Shared.ExportOptions();
File_destination = new CrystalDecisions.Shared.DiskFileDestinationOptions();
Format_options = new CrystalDecisions.Shared.PdfRtfWordFormatOptions();

sDate_time = DateTime.Now.ToString("ddMMyyyyHHmmssff");
sDestination_path = sDestination_file + sPolicy_number + sPolicy_number1 + "-" + sDate_time + ".pdf";

File_destination.DiskFileName = sDestination_path;
myExportOptions = rptCust.ExportOptions;

myExportOptions.ExportDestinationType = CrystalDecisions.Shared.ExportDestinationType.DiskFile;
myExportOptions.ExportFormatType = CrystalDecisions.Shared.ExportFormatType.PortableDocFormat;
myExportOptions.DestinationOptions = File_destination;
myExportOptions.FormatOptions = Format_options;

rptCust.Export();