<%  If id_uno = "" Then%>

    <a href="esplora.aspx?id_uno=<%#Container.Dataitem("id_uno") %>"><%#Container.DataItem("nome_cartella")%></a>
   <%ElseIf id_uno <> "" Then%>
   <% Response.Write(id_uno)%>
       <a href="esplora.aspx?id_due=<%#Container.Dataitem("id_due") %>"><%#Container.DataItem("nome_cartella")%></a>

   <%  End If

       %>