Want to export gridview to excel and then 2nd sheet of same excel show graph on the specific columns of the exported excel

Hi All,
 
I am newbie. I am looking code for the "How to export gridview to excel and 2nd sheet of the same excel should show graph on the specific columns of the gridview." It's very urgent. Please ,please help me in this.
I am using visual studio 2008 and looking code in c#.
 
Regards
Tushar Goel