Does Paint.Net still provide its source code [closed]

The source is no longer available.

See here:
http://blog.getpaint.net/2009/10/14/paintnet-v35-beta-3-build-3572-is-now-available/

And more info here:
http://blog.getpaint.net/2007/12/04/freeware-authors-beware-of-“backspaceware”/