A.   No member of the town board of trustees may sell, or furnish for a consideration, any materials or supplies for use of the town; and any member of the board of trustees voting for, or consenting to, or being a party to, such contract or purchase is personally liable as provided by law.
   B.   The town board of trustees shall not make any contract with any of its members, or in which any of its members shall be directly or indirectly interested, such contracts being prohibited by law.
   C.   No officer of the town may become directly or indirectly interested individually in any sale, lease, or contract which he is authorized to make, such being prohibited by law. (1984 Code § 7-109)