How do I call a web site from a winform app without having to log in again?

[tom rageley]

Hi,

Can someone tell me how I would go about calling a web application
that uses forms authentication from a winform application where the
user has already been authenticated? I'd like to insert their
credentials into a cookie in the same fashion as if they'd been
authenticated by the web site rather than the winform application.
Can I just set up the cookie and make the request to the desired URL?

Thanks in advance,
Tom Rageley