how to display the rid view records using chart

Question

 Gridview records as follows;

in gridivew records as follows;

  Facname    Rating

   Ram          Excellent

   Gopi          Good

  Suresh       Fair

  Vijay          Poor

 

i want to show the above gridview record to be displayed in the Chart.

for that how can i write the code.

please help me.

Regards,

Narasiman P.