SQL Insert In Aspx.vb File (or Share Variable With .aspx Page)

Hi,
I have a form page with an insert like this:
<asp:SqlDataSource ID="addProductDataSource" runat="server"
    InsertCommand="INSERT INTO test(
        title1,
        firstName1,
        lastName1,
        dateOfBirth
    ) VALUES (
        @title1,
        @firstName1,
        @lastName1
        @dateOfBirth
    )"
    ConnectionString="<%$ ConnectionStrings:yourQuoteCentreConnectionString %>">
        <InsertParameters>
            <asp:ControlParameter ControlID="dateOfBirth" Name="dateOfBirth" Type="DateTime" />
            <asp:ControlParameter ControlID="title1" Name="title1" PropertyName="Text" />
            <asp:ControlParameter ControlID="firstName1" Name="firstName1" PropertyName="Text" />
            <asp:ControlParameter ControlID="lastName1" Name="lastName1" PropertyName="Text" />
        </InsertParameters>
</asp:SqlDataSource>
In default.aspx.vb I have:
Protected Sub Wizard1_FinishButtonClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.WizardNavigationEventArgs) Handles Wizard1.FinishButtonClick
    'CREATE DATETIME FROM USERS BIRTH DATE
        Dim dateOfBirth As New System.DateTime(applicantYear.SelectedValue, applicantMonth.SelectedValue, applicantMonth.SelectedValue, 0, 0, 0)

    'INSERT TO DATABASE
        addProductDataSource.Insert()

End Sub
I would like to reference the variable dateOfBirth created in default.aspx.vb in the insert query on the page, or ideally move the insert query into the aspx.vb page.  Would this make more sense to do?
Thanks,
Paul