Passing object to a com+ with variant params

[Mihaly]

Hello, i'm using a VC++ com+ object, it's reference in
vs .net, this com object have a function that have to
params, the interop com object recive Object Params and
the original com object say that this params are variants.

I'm traying to pass "object" variables to the params but
the com object return an error or a null object, the
piece of code that i'm using is:

using AgenObj;
using Scripting;

namespace SaludTotalv10.Citas
{
/// <summary>
/// Summary description for Visualizar.
/// </summary>
public class Visualizar : System.Web.UI.Page
{
protected AgenObj.AutorizacionClass
oAgendaAutoCls;
private void Page_Load(object sender,
System.EventArgs e)
{
// Put user code to initialize
the page here
oAgendaAutoCls = new
AgenObj.AutorizacionClass() ;
}

private void Button1_Click(object sender,
System.EventArgs e)
{
..
..

object User_TId = "1";
object User_Id = "79779719";
Scripting.Dictionary sdAfiliado =
(Scripting.Dictionary)oAgendaAutoCls.ConsultaAfili ado
(User_Id,User_TId);
Object oNombre = "Error";
try
{
Object d =
sdAfiliado.get_Item( ref oNombre) ;

if (d.ToString() == "0")
{
oNombre
= "nombre";
d =
sdAfiliado.get_Item( ref oNombre) ;
Label1.Text =
d.ToString();
}
else
{
Label1.Text =
d.ToString();
}
}
catch (System.Exception ex)
{
Label1.Text = "Fallo el
llamado al objeto:\n "+ ex.Message;
}
..
..
..
i'm trying to use pasing the objects like int or strings
(User_TId = 1, User_TId
= "1",User_Id="79779719",User_Id=79779719, and
combinations) and never revive a good return,
what i'm doing wrong?
In some cases i recive a "Object reference not set to an
instance of an object", and others wrong params or not
identified in interface.
ANY SUGGESTION?