report generating with plots

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C#

ZedGraph

reporting

I would like to create a report containing a varying number of graphs. I'd like to do this using a free library if possible, and export the report to a pdf or some other common format.

I understand the ZedGraph is a good free plotting tool and I've heard some good things about the Microsoft Report Generator, although I can't find it in VS 2012 express. The key is that the number of graphs varies, so all graph creating must be done programmatically.

If anyone has any further advice it would be greatly appreciated.