Corn Casserole

15 ounce can whole corn -- undrained
15 ounce can creamed corn
1 cup macaroni -- uncooked
1 cup cheddar cheese -- diced
1 stick margarine -- melted
2 tablespoons onion -- chopped
salt and pepper

Mix all together and put in casserole dish. Bake at 350°F for one hour; stirring half way through baking time.