There are plenty of 3rd party solutions on the market which would help you include some kind of charting support with your ASP pages and WinForms applications – ChartFX, ComponentArt’s Charting, Dundas Chart - these are just few from many available on the market today.

As it turned out, Microsoft has decided to add out-of-the-box support for Charting as well - <asp:chart runat=”server”/>.
Read about it here - New ASP.NET Charting Control: <asp:chart runat=”server”/> by Scott Guthrie – everything you need to know about the .Net 3.5 framework new addition.

For  additional information also visit Alex Gorev’s blog.

Note 1: Even though caption says it is ASP.Net solution, in the original you would find link to WinForms sample as well.
Note 2: Do not worry about Dundas copyright – “Microsoft acquired Dundas Data Visualization Intellectual Property in April 2007.”