Overlapping of two image

HI all,
           I am facing problem with the dynalically generating the image at particular with coordinate points on image map through code behind (aspx.cs).
    As per my requirement i need to generate Hotspots dynamically and also displaying an image to indicate the Hot spots.
Please send me the code above that ...
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thanks in advance

            System.Drawing.Image original = Image.FromFile("main_item_file.jpg");

            Graphics gra = Graphics.FromImage(original);

            Bitmap logo = (Bitmap)Image.FromFile("sold_logo.jpg");

            gra.DrawImage(logo, new Point(70, 70));

 

            original.Save("filename.jpg");