Web Scraping/post through two urls

Does anyone know how to use the post method to get through two urls to screen scrape information from the second url?

ie - i need to post some values to get to the first url. Then to get to the second url i need to post a second set of values. It's the second url where i need to screen scrape information from. (Note i need to go through the first url in order to get to the second one)

I can get it going in VB6 but not .NET.

Any code, help or suggestions would be truly appreciated.