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.

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You're looking for the CookieContainer property and class.