asp.net vb.net code behind

I would like to carry the value of SelectedPartNo  from code behind to aspx
and i have id2=<%=SelectedPartNo%> and it is not working now.

How can I fix it?

Test.vb

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim SelectedId = String.Empty
        SelectedId = Request.QueryString("id")
        Dim SelectedPartNo = String.Empty
        If (SelectedId <> "") Then
            SelectedPartNo = SingleItem(SelectedId, "1")
        End If
End Sub

Text.aspx
<asp:DataList RepeatColumns="4" Font-Bold="true" 
        ID="DataList1" runat="server" DataSourceID="SqlDataSource1" Width="630px">
        <ItemTemplate>
            <br /><a href=Default.aspx?PL=Sitemap&id=<%# Eval("CATEGORY")%>&id2=<%=SelectedPartNo%>><font color="blue" size="2"><%# Eval("CATEGORY") %></font></a><br />
        </ItemTemplate>
    </asp:DataList>

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