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answers:

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I am trying to do some charting in my of my C#.NET applications using the .NET Chart Control. Is there a way to make a popup that shows the exact data point that the cursor is over when it is hovering over the chart?

A: 

Check the MapArea class: http://msdn.microsoft.com/en-us/library/system.web.ui.datavisualization.charting.maparea.aspx

It'll let you create maps that apply to different areas of the chart and contain their own tooltip.

Sorax