can i used craft.entries.section into my Controller
If you want to use ElementCriteria in your controller, this is how to go about it:

$criteria = craft()-&gt;elements-&gt;getCriteria(ElementType::Entry);
$criteria-&gt;section('products');
$criteria-&gt;limit = 9;

$products = $criteria-&gt;find();


Read this page for more info on the subject.