I have a webpage that users can upload files to one of my servers. Before the user can access the webpage, he/she must log onto my company's intranet. How can I capture who is logged into the intranet site so that I can use it in my code?

You can use System.Security.Principal class and WindowsPrincipal to get the current Identity, which role (Administrator/User) he belongs to.

Vasudevan Deepak Kumar
Personal Web: http://www.lavanyadeepak.tk/
I Blog At: http://deepak.blogdrive.com/ and http://deepakvasudevan.blogspot.com/

Will this give me their Active Directory username that they used to log into the intranet? If not, is there anyway to get that?