No director or other officer of the district shall in any manner be interested, directly or indirectly, in any contract awarded or to be awarded by the board, or in the profits to be derived from it. Violation of this section is a misdemeanor and a director or officer convicted shall forfeit his office, and shall be punished by a fine not exceeding one thousand dollars ($1,000), or by imprisonment in the county jail not exceeding six months, or by both such fine and imprisonment.