Hi All,

Thanks for the reply. M-; works for me. It does both the job of commenting
and un-commenting.

@Drew Adams : When i did 'C-h k' and tried 'C-c C-c' below was the
description
"runs the command comment-region, which is an interactive compiled Lisp
function."

Just trying to understanding, both C-c C-c and M-; does the job of
commenting, what is the basic difference ?
Where can i find all such emacs shortcuts related to programming ?

One more question, is it allowed to resort help from group by sending out
mail to the group mail id
help-gnu-emacs@gnu.org ?

-- 
Regards
Nachiappan A