List client certificates

Hi,

I'm developing a Web application with VStudio 2005 + .net 2.0 + IIS 6.0

In the Web application I've to digitally sign a pdf document with a
user certificate. In the page where I've to sign I list the user
certificates with this code:
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X509Store store = new X509Store(StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly);
X509Certificate2Collection certCollection = store.Certificates;
if (certCollection.Count < 1) {
lblMsg.Text = "No hay certificados 'Personales' Instalados.";
return; }
foreach (X509Certificate2 c in certCollection)
DDListCertifi.Items.Add(c.Subject);
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This code works fine in my Visual Studio local web server. I can see
the user certificates in the dropdownlist, but when I export the code
to other server, it doesn't works. I can't see the certificates in the
dropdown,

¿can anybody help me?

Thanks in advance. Moisés

.