Three Bean Salad

1 3 oz can wax beans

1 can green beans

1 can red kidney beans

1 small onion sliced thin

1/2 green pepper chopped

Dressing

2/3 cup sugar

2/3 cup vinegar

1/3 cup salad oil

1 teaspoon salt

1/2 teaspoon celery seed

1/3 teaspoon black pepper