C# .NET Charts Libraries/Code? [closed]

Question

I am creating some reporting software that will generate excel workbooks with charts and all related data. Besides the built in libraries and .NET Office integration features, is there any other tools or code that people found useful to creating similar projects?

EDIT: I am targeting winforms.

Answer 1

I've used ZedGraph before, and I found it pretty good for a free library.

Answer 2

If you are not already aware... Microsoft released these free charting controls for .NET

http://weblogs.asp.net/scottgu/archive/2008/11/24/new-asp-net-charting-control-lt-asp-chart-runat-quot-server-quot-gt.aspx