exprting crystal report pdf format

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VB

PDF

CrystalReports

reporting

Hi all,

I am converting my Crystal report as pdf format through coding but I am facing some error's while converting, here is my code:

Dim CrExportOptions As ExportOptions
       Dim CrDiskFileDestinationOptions As New  _
       DiskFileDestinationOptions()
       Dim CrFormatTypeOptions As New PdfRtfWordFormatOptions()
       Dim sd As String = "nas"

       CrDiskFileDestinationOptions.DiskFileName = "c:\" & sd & ".pdf"
       em1 = "c:\" & sd & ".pdf"
       CrExportOptions = crydatwis.ExportOptions
       With CrExportOptions
           .ExportDestinationType = ExportDestinationType.DiskFile
           .ExportFormatType = ExportFormatType.PortableDocFormat
           .DestinationOptions = CrDiskFileDestinationOptions
           .FormatOptions = CrFormatTypeOptions
       End With
       crydatwis.Export()

crydatwis.Export() this line showing error like 'Missing parameter values.'

How shall I recover this issue?