Image Processing

Question

hey guys,

If I have a bitmap image with a completely white background that consists of many singular dots, i.e.
http://i646.photobucket.com/albums/uu181/DavidPaulG/20090219115136.png
which I also have a List of Points i.e. List<Point> that stores the co-ordinates of each dot on the Bitmap Image.
if I want to fill in the dots with lines, i.e.,
http://i646.photobucket.com/albums/uu181/DavidPaulG/20090219115505.png
and also have the Bitmap object itself updated
How do I go about this, I have tried the Graphics.DrawPolygon but have had no luck,
Any suggestions would be greatly appreciated.
David