I'm using ASP.NET Web Forms.

I need  charting controls that are interactive - I need some sort of "click" event because when the user clicks on a "slice" of a "pie chart" I have to know what the "slice" the user clicked so I can update the page accordingly .....

Please let me know if the Xceed control can do this or not :-)

Hi Sebastian, 

Yes, this can be done with the Xceed Chart for .net. It is highly interactive.

You can view an example that shows exactly what you need with an interactive pie chart in the Chart Explorer.

Its default location is : C:\Xceed Samples\Xceed Chart for ASP.NET v4.3\CSharp\Xceed Chart Explorer\

you need to run it as a "web Site".

When you run it, you can browse the samples to the left, choose "All Examples " => "Getting Started" => "Image Map Postback" which shows an interactive pie chart. 

I hope this helps!