Track Visitors of a Website using Cookies in ASP.Net

Hello,

I have a scenerio like i have a website where by visitors comes in like you have aspforum.net. I want following:

1. when user visit on my site a cookie or script generate on the user machine

2. then if user is searching for shoes, books, or any thing that data should come on my server database so i can trace what is user behavior and likes and dislike.

how can i achieve it please suggest.

thanks