hynamic hyperlinks

hi
i am creating a forum where by different content gets displayed according to the relevent cookies FOR EXAMPLE
http://localhost:64846/WebSite/Secret/Default.aspx?c_id=1
the above url displayes all the comment with the id number 1 (from the c_id above), the information then gets shown in a gridview. code being ...
//... the beginnings

</asp:TemplateField>

<asp:TemplateField HeaderText="Icon">
<ItemTemplate>

<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%#"?del=" + Eval("c_id") %>' Text="some"></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>

//... end parts

the generated url from the code above is : http://localhost:64846/WebSite/Secret/Default.aspx?del=1
is there a way of keeing the " c_id=1 " ...