Digitally sign a pdf from usb token at client end

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C#2.0

C#

ASP.NET

Hi,
I am using a windows application to sign from usb token. It works perfectly. I am using following code to pick a certificate from store at client end.

X509Certificate2UI.SelectFromCollection(col, "Certificates", "Select one to sign", X509SelectionFlag.SingleSelection);<br />

It prompts a dialog box containing all the certificates stored in the store. It is also working fine in a web application but when I deploy my web application to IIS 5.1. this message is dispalyed:-
The current state is not interactive.