which is the best free graph component?

I am looking for a free graph (chart) builder for asp.net for more or less complex graphs (the output should be nice :-))

Which one is the best?

Thank you for some suggestions!

anyone?

I would like ot show a graph showing website visits for the last 30 days, and for the last 30 days of the previous year.

Would be cool if I can let the user apply filters from the data i allready store like location, language, membership, etc

Willing to purchase one? ComponentOne has a good chart control.

Try this m8

WebChart

Let me know if you like it not used it myself yet