how to get data in pie chart or bar chart

Hi,How to get data from data base and display in pie chart or bar chart.Which is good.I am new to this.I have page which will display one question and 4 radio buttons.upon user clicking radio button i need to store those values in databse.I need to calculate for each question what is the rate entered by user.I want to display this in pie chart.Could you please help me on this.Is there any classes in .net or do i need to import.
sandyarani81Asked:
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Bruce_1975Connect With a Mentor Commented:
ZedGraph is a very powerfull open source solution for displaying multiple data.
 
http://www.codeproject.com/KB/graphics/zedgraph.aspx
http://zedgraph.org/wiki/index.php?title=Main_Page

Regards,
Bruce
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