pass parameter to crystal report

Hi,

I having pass parameter to crystal report problem.

At the case 1), it is work, But at the case 2) isn't work. Why?

Something missed?

I am very interested this fact, please help....

1)

        Dim objRpt As New rptinvoice

        paramField.ParameterFieldName = "deliverynote"

        discreteVal.Value = deliverynote

        paramField.CurrentValues.Add(discreteVal)

        paramFields.Add(paramField)

        objRpt.SetDataSource(dsinvoice)

        CrystalReportViewer1.ParameterFieldInfo = paramFields

        CrystalReportViewer1.ReportSource = objRpt

        CrystalReportViewer1.Refresh()

2)

        Dim objRpt As New rptinvoice

        objRpt.SetParameterValue("deliverynote",dsinvoice)

        objRpt.SetDataSource(dsinvoice)

        CrystalReportViewer1.ReportSource = objRpt

        CrystalReportViewer1.Refresh()