ASP.net vb Crystal Report to Excel without using CR to export

I am trying to send a crystal report (Rpt) to excel in asp.net without doing the conversion in the CR or displaying the CR. I get format error. What would be the correct code I need to modify the below?
Thanks

Private Sub ReportToPDF(ByVal Rpt As ReportDocument)
        Dim s As System.IO.MemoryStream = Rpt.ExportToStream(ExportFormatType.PortableDocFormat)
        ' the code below will create pdfs in memory and stream them to the browser
        ' instead of creating files on disk.
        With HttpContext.Current.Response
            .ClearContent()
            .ClearHeaders()
            .ContentType = "application/vnd.ms-excel"
            .AddHeader("Content-Disposition", "attachment; filename=LaborReport.xlsx")
            .BinaryWrite(s.ToArray)
            HttpContext.Current.ApplicationInstance.CompleteRequest()
        End With
    End Sub
BKennedy2008Asked:
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BKennedy2008Author Commented:
I also changed to :
.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"

Same Format error
BKennedy2008Author Commented:
I got this to work
 CrystalReportViewer1.ReportSource = rpt

        Dim strExportFile As String = Server.MapPath(".") & "/WebReport.xls"

        rpt.ExportOptions.ExportDestinationType = ExportDestinationType.DiskFile
        rpt.ExportOptions.ExportFormatType = ExportFormatType.Excel
        Dim objOptions As DiskFileDestinationOptions = New DiskFileDestinationOptions
        objOptions.DiskFileName = strExportFile
        rpt.ExportOptions.DestinationOptions = objOptions
        rpt.Export()
        objOptions = Nothing
        rpt = Nothing
        Response.Redirect("WebReport.xls")

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