Stephen Gower has 2 samples called Liquid Brain and Bucky Balls. They are from 2003 so the source was designed to run against an earlier version of the framework.

C Sharp corner requires free registration to get the source. If that bothers you you can find one of the samples here

Fixing the Code:
To compile the code against the current version of the framework you need to add 'null' as an additional 1st parameter in the font.DrawText call and change the light.enable() to light.update()