Section 107(2)(a) in The Punjab Municipal Act, 1999
(a)every contract shall, -(i)in the case of a Municipal Corporation, be signed and executed on behalf of the Municipal Corporation, by the Mayor and the Commissioner;(ii)in the case of a Municipal Corporation or a Nagar Panchayat, be signed and executed on behalf of the Municipal Corporation or the Nagar Panchayat, as the case may be, by the President and the Executive Officer;