How do You Export Crystal Report to PDF Without Writing to File and With no Memory Issues?

Hello,

I am using Visual Studio .NET 2002.  I have a Crystal Report in my folder, which gets dynamically populated.  The code I have right now displays the report as a PDF without writing a file to the server:

        Dim strConn As String
        Dim SQL As String
       
        strConn = ConfigurationSettings.AppSettings("ConnectString4")
        Dim conn As New OleDbConnection(strConn)

        Dim strPermit As String
        strPermit = Request.QueryString("SWP")
 
        SQL = "SELECT * from VW_SWP where swp_id=" & strPermit
 
        Dim da As New OleDbDataAdapter(SQL, conn)
        da = New OleDbDataAdapter(SQL, conn)

        Dim rpt As CrystalReport1 = New CrystalReport1()

        Dim dt As New DataTable()

        da.Fill(dt)

        rpt.SetDataSource(dt)
       
        CrystalReportViewer1.ReportSource = rpt

        conn.Close()
        conn.Dispose()
        dt.Dispose()

  Dim crExportOptions As ExportOptions

        crExportOptions = rpt.ExportOptions
        With crExportOptions
            .FormatOptions = New PdfRtfWordFormatOptions()
            .ExportFormatType = ExportFormatType.PortableDocFormat
        End With

        Dim req As ExportRequestContext = New ExportRequestContext()
        req.ExportInfo = crExportOptions

        Dim st As System.IO.Stream
        st = rpt.FormatEngine.ExportToStream(req)

        rpt = Nothing

        Response.ClearContent()
        Response.ClearHeaders()
        Response.ContentType = "application/pdf"

        Dim b(st.Length) As Byte

        st.Read(b, 0, st.Length)

        Response.BinaryWrite(b)

        st.Close()
        st = Nothing

        CrystalReportViewer1.Dispose()

        Response.End()

The problem I am having is that everytime the export code gets executed it adds a few MBs to the ASP.NET worker process, and once this gets to about 150 MB the line:   rpt.SetDataSource(dt)
stalls, and therefore the web page never loads, so the report is not shown.  Is there something I'm not disposing of so I have a memory leak, or is there a better way to do this?  And why would the  rpt.SetDataSource(dt) line fail when the worker process is only at 150 MB?  I would think that this is relatively low...Thanks for your help!



Grant