Hi,
May be the following code will help you. Pass your loaded report file to the following function and probably it would open a pdf file.
Private Sub PrintInAcrobat(ByVal rptDoc As ReportDocument)
Dim Fname As String
Dim crExportOptions As ExportOptions
Dim crDiskFileDestinationOptions As DiskFileDestinationOptions
rptDoc.PrintOptions.PaperSize = PaperSize.PaperA4
rptDoc.PrintOptions.PaperOrientation = PaperOrientation.Portrait
Fname = Server.MapPath(".") & "\" & Session.SessionID.ToString & ".pdf"
crDiskFileDestinationOptions = New DiskFileDestinationOptions
crDiskFileDestinationOptions.DiskFileName = Fname
crExportOptions = rptDoc.ExportOptions
With crExportOptions
.DestinationOptions = crDiskFileDestinationOptions
.ExportDestinationType = ExportDestinationType.DiskFile
.ExportFormatType = ExportFormatType.PortableDocFormat
End With
rptDoc.Export()
Response.ClearContent()
Response.ClearHeaders()
Response.ContentType = "application/pdf"
Response.WriteFile(Fname)
Response.Flush()
Response.Close()
System.IO.File.Delete(Fname)
End Sub
Hope it helps!!