Printing to PDF from CrystalReportViewing returns blank page

Question

Hi All,
   I have a web report that I run. When the report generates in the CrystalReportViewer I see my results. However, if I click the button to Print to PDF, it results in a PDF with no data. If I click on the Next button as well to go to the next page in my report, it returns blank results.
This apparently started happening when I used date parameters being passed to my stored procedure:
        parameterField = report.ParameterFields("@callstdate")
        parameterField2 = report.ParameterFields("@callendate")
I'm using VS 2008 and CR2008.
Any ideas why this is happening?
Thank you in advance,

Answer 1

1)Any export type I use returns no data on the exported report
2)Changed PDF to ActiveX and it printed the report with no data
3)Remove parameters from my webapp and let the Viewer prompt for them. Now PDF works and everything else.
Here's my code:
    Protected Sub display_report()
        parameterField.CurrentValues.Clear()
        parameterField2.CurrentValues.Clear()
        parameterField3.CurrentValues.Clear()
        CrystalReportViewer2.ParameterFieldInfo.Clear()
        parameterField = report.ParameterFields("@callstdate")
        parameterField2 = report.ParameterFields("@callendate")
        parameterField3 = report.ParameterFields("Group")
        For Each li As ListItem In Me.ListBox1.Items
            If li.Selected = True Then
                ' Add all parameters value here
                parameterField3.CurrentValues.AddValue(li.Value)
            End If
        Next
        report.SetParameterValue("@callstdate", CDate(st_date.Text))
        report.SetParameterValue("@callendate", CDate(st_date.Text))
        CrystalReportViewer2.ReportSource = report
    End Sub