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

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Regards
Nachiappan A