Hi guys,
I have a guy who likes to open a classified advertisement site, but the guy is not interested in coding, so i heard that ASP.net and PHP two popular languages used now. I want a site with good functionality and with good SEO. So please suggest me which would be the best for the site.
Thanks in advance

Either.

Use whichever your hosting supports. There are several threads on "which is best" we don't need another one.
http://www.webmaster-talk.com/asp-fo...ersus-php.html
http://www.webmaster-talk.com/php-fo...s-asp-net.html
http://www.webmaster-talk.com/asp-fo...dvantages.html