how to develop bar chart or pie chart in asp.net using data base values

Question

Hi all,
        Here i am saving data through my website and then i am generating reports and displaying the data in gridview only.
Now i need to show that data in bar chart or pie chart by pressing button click then it need to fetch the data from data base and then show the chart.
How can i achieve this to show the bar charts.
Please i don't want in crystal reports or third party control.
tell me is there any way through MS Excel sheet(no problem).