Why would you just want to put on a bunch of fat? There is a distinct difference between 'bulking' and 'just gaining weight' in terms of building your body.
So, yes--carbs are your friend when trying to bulk, but no--not all carbs are created equal. Unless you are bulking at 300+ lbs. you should be able to eat reasonably good foods and reach your weight gain goals with a reasonably decent ratio of lbm:fat gain.
Stick with brown grains(real), oatmeal, potatoes---and try to stay away from the more processed type.