how can I reset the parameter of an objectdatasource ?

I have two panels. The first panel saves the invoice information (header information).

The second panel saves the invoice lines for this invoice (a gridview with 1 or more lines).

on add of a new invoice, I save the invoice header and then return the invoice id without refreshing the page. The InvoiceID
which is bound to the ObjectDataSource does not get reset. How can I do this ?

The actual insert method (InsertInvoiceLines) is in the business object.

I tried using session variables, even a session variable is not being reset  and I cannot access a session variable in the business object. What other options do I have if I cannot reset the objectdatasource Parameter value ?

<asp:ObjectDataSource  ID="odsInvLines" TypeName="BusinessObject.Invoice" runat="server"
         OldValuesParameterFormatString="original{0}"  SelectMethod="GetInvoiceLinesByInvoiceID" InsertMethod="InsertInvoiceLines" UpdateMethod="UpdateInvoiceLines">
        <UpdateParameters>
        <asp:Parameter Name="InvoiceID" Type="Int64" /> 
        <asp:Parameter Name="Description" Type="String" />
        <asp:Parameter Name="Rev_Activity_Code_ID" Type="Int32" />
        <asp:Parameter Name="Quantity" Type="Int32" />
        <asp:Parameter Name="Unit_Selling_Price" Type="Double" />
        <asp:Parameter Name="Total_Amount" Type="Double" />
        <asp:Parameter Name="BEGIN_BILLING_PERIOD" Type="String" />
        <asp:Parameter Name="END_BILLING_PERIOD" Type="String" />
        <asp:Parameter Name="OriginalLine_Number" Type="Int64" />
        </UpdateParameters>
        
        <InsertParameters >
        <asp:Parameter Name="InvoiceID" Type="Int64" /> 
        <asp:Parameter Name="Description" Type="String" />
        <asp:Parameter Name="Rev_Activity_Code_ID" Type="Int32" />
        <asp:Parameter Name="Quantity" Type="Int32" />
        <asp:Parameter Name="Unit_Selling_Price" Type="Double" />
        <asp:Parameter Name="Total_Amount" Type="Double" />
        <asp:Parameter Name="BEGIN_BILLING_PERIOD" Type="String" />
        <asp:Parameter Name="END_BILLING_PERIOD" Type="String" />
        <asp:Parameter Name="OriginalLine_Number" DefaultValue="0"  Type="Int64" />
        </InsertParameters>
</asp:ObjectDataSource>

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