Passing UN and PW through a HTTP response

I was wondering if its possible to redirect a user to a web page that required a username and password such as the one you would require for an IIS authenticated web site and automatically send through the UN and PW, eg -

Respons开发者_高级运维e.Username = "";

Response.Password  = "";

Response.Redirect("url");

---

I do not believe this is possible under any of the authentication forms provided by default. This would not work across domains either.