Have you ever copied some code from a running application into a new one "because you knew the code worked" ... and then it crashed! (Don't lie! You know you have.) That can happen with the Chart control for ASP.NET that is "semi-new" in Framework 4.0 and Visual Basic 2010. Semi-new because it was available as a download in ASP.NET 3.5. This article explains one reason why it could happen with the Chart control ... and also includes a complete downloadable application that charts data from the Northwind database.
Code and ideas for this article are taken from "Pro ASP.NET 4.0 in VB 2010" by permission of the publisher, Apress. I'm the co-author and it's scheduled to be released in October 2010. But this article goes beyond what is in the book!