This example source is meant to teach you how to log in to a website, use that login cookie to navigate to another webpage on the site with the same cookie (so that you stay logged in) and grab some info. Can be used in many situations, I used SupportForums as my example login. You can make changes to this source to log in to another website and grab info, it has a lot of uses. This will teach the basic .net user how to use web requests/responses to login+getinfo.
This uses a bit of Regex (to teach you how to loop through and grab text that may change in the source) as well.
Enjoy!