How sort report based upon parm?

Basics:  vb6 sp5, cr8.0, W/2000.

I have written a Visual Basic program that calls a Crystal Report and passes various parameters to it.  One of these parms is the sort parm.  In CR I want the report to sort in one of three ways based upon the passed parm from vb.

I thought that creating a formula that would interogate the parm and point to the field to be sorted would work.  But it gives me errors.  

For example, here is the code in a formula in CR that uses the Select Case method:

Select Case {?mSort_Opt_Parm}
Case "Invoice #"
formula = {Reporting.Inv_No}
Case "Invoice Date"
formula = {Reporting.Inv_Date}
Case "Delivery Date"
formula = {Reporting.Del_Date_Sort}
End Select

This code generates an error.  I swapped out the Select Case with an If, ElseIf etc. code and it does not work either.  Here is that code:

If {?mSort_Opt_Parm} = "Invoice #" Then {Reporting.Inv_No}
ElseIf {?mSort_Opt_Parm} = "Invoice Date" Then {Reporting.Inv_Date}
Else {Reporting.Del_Date_Sort}

I am trying to come up with a formula that points to the field I want the report to sort on, i.e. {Reporting.Inv_No}.  With this type of field, I would only have to add it to the sort dialog box and the report would supposedly sort in the correct sequence based upon the passed parm.  Should I be doing this differently?

Question:  How do I sort a report based upon a passed parameter?

Thanks for the help.
Who is Participating?
How are you calling the report from VB.  CR provides a sort field array to use.

Here is the code I use

Public Sub preview_Report_from_View_with_Sort(txt_Report_File_Name As String, _
                                                                        txt_Record_Selection_Formula As String, _
                                                                        txt_Sort_Fields() As String, _
                                                                        int_Sort_Field_Count As Integer)
Dim i As Integer
Dim rpt_title As String
    cr_Generic_Report.WindowTitle = rpt_title

    cr_Generic_Report.ReportFileName = txt_Report_File_Name
    cr_Generic_Report.ReplaceSelectionFormula txt_Record_Selection_Formula
    For i = 0 To int_Sort_Field_Count - 1
        cr_Generic_Report.SortFields(i) = txt_Sort_Fields(i)
    Next i
    cr_Generic_Report.WindowState = crptMaximized
    cr_Generic_Report.Destination = crptToWindow
    cr_Generic_Report.WindowShowCloseBtn = True
    cr_Generic_Report.Action = 1
End Sub

The sort fields are strings like {view_rpt_basic.student_id}

If you need more information let me know.
good luck

EYoungAuthor Commented:

Here is the code I use in VB to call the report:

Private Sub Form_Activate()
    Set Report = New dsrDetail_and_Summary
    Report.EnableParameterPrompting = False

    Report.ParameterFields(1).AddCurrentValue mTeam_No_Parm
    Report.ParameterFields(2).AddCurrentValue mTeam_Name_Parm

    If mTeam_No_Parm <> 0 Then
         Report.RecordSelectionFormula = "{Reporting.mKey} = '" & mKey2 & "'"
    End If

    Screen.MousePointer = vbHourglass
    CRViewer1.ReportSource = Report
    CRViewer1.DisplayTabs = False
    CRViewer1.DisplayToolbar = True
    CRViewer1.EnableGroupTree = False
    CRViewer1.EnableExportButton = True

    Screen.MousePointer = vbDefault
End Sub


The report has two levels of grouping and then one of three fields make up the third sort field.  For example, the sort fields could be Group1, Group2, Invoice_No.  Or the sort fields could be Group1, Group2, Invoice_Date.

Would I add the .SortFields(i) as follows:

CRViewer1.SortFields(1) = Group1
CRViewer1.SortFields(2) = Group2
CRViewer1.SortFields(3) = Invoice_No

Thnaks for the help.
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EYoungAuthor Commented:
I tried doing the example above and it did not have any effect on the sort sequence of the report.

Would appreciate any help.  Thanks.
EYoungAuthor Commented:
Oops, I should have said I tried:

Report.ReportSortFields(1) = ...
EYoungAuthor Commented:
Thanks for the help.
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