how to get the map coordinates of using ImageMap control

Hi
 
i am using asp.net ImageMap control, in this control i am displaying one map.. and i am not know how to get the co-ordinates of regions in the map.
 
(example: i am taking India map, if i click on one state then that state name is displayed)
 
How can i know the coordinates of each region?
 
my code like:
 

<asp:ImageMap ID="ImageMap1" runat="server" ImageUrl="images/ImageMap1.jpg">
     <asp:PolygonHotSpot Coordinates="" PostBackValue="Test"  />
</asp:ImageMap>

 

Thanks
K.Ajay