Front end Ordering

Hi I would like to display the list elements by the backend ordering, by default it's sort by Item ID.

I hope you can help me

Thanks.. .

e.g. ../models/yourmodels.php


if ($orderCol && $orderDirn)
{
//$query->order($db->escape($orderCol . ' ' . $orderDirn));
}
$query->order($db->escape('a.id' . ' ' . 'DESC'));