how to use webbroswer authentication

I have .net Application in which i have webbroswer control in which i do following steps

Navigate to site. (Using Code) Popup to select installed digital signature. Enter user id and password. (on website) system login.开发者_运维问答.. (on website)

I want now my HttpWebRequest to navigate a URL which is only accceible after login to download particular PDF...

How can i do this....

because when i try to create new object it treat that request as not authenticated what i think so there will be some mechanism so i can pass all cookie session values to that reuquest object or any way to access that URL with webbroswer function ... without disturbing UI of webbroswer.

You're looking for the CookieContainer property and class.