setting font-lock-face to different values for different major-modes

I am trying to set for example font-lock-comment-face to Blue for csharp-mode and for c++-mode to Red is this possible or not?

Right now im using:

(set-face-attribute 'font-lock-comment-face nil :foreground "#57a64a")
(set-face-attribute 'font-lock-keyword-face nil :foreground "#569cd6")

but this sets the value globally and not only for the mode.

Forgot to add the version im using: GNU Emacs 24.4.1 (i686-pc-mingw32) of 2014-10-24 on LEG570 on Windows 8

Wow! Thank you, I've thought it's not possible, but then i've found this: http://www.emacswiki.org/emacs/FacesPerBuffer

Just look at the example from wiki, seems like exactly what you need:

 (make-face 'php-comment-face)
 (set-face-foreground 'php-comment-face "LightGrey")
 (add-hook 'php-mode-hook 
       (lambda ()
        ;; ...
        (set (make-local-variable 'font-lock-comment-face)
             'php-comment-face)
        ;; ...

Thanks to this question from related: Set Emacs defaut font face per-buffer/mode

UPD

to win the cc-mode bindings, you should put the (add-hook csharp-mode-hook ... after (add-hook c-mode-hook ..., like this:

(make-face 'c-comment-face)
(set-face-foreground 'c-comment-face "Red")

(add-hook 'c-mode-hook
       (lambda ()
        ;; ...
        (set (make-local-variable 'font-lock-comment-face)
             'c-comment-face)))


(make-face 'cs-comment-face)
(set-face-foreground 'cs-comment-face "Blue")

(add-hook 'csharp-mode-hook
       (lambda ()
        ;; ...
        (set (make-local-variable 'font-lock-comment-face)
             'cs-comment-face)))

If you have hook codes in separate files, you should load csharp-mode settings after c-mode. Don't forget to (remove-hook ... to try this out.