Section 9(1)(j) in The Delhi Municipal Corporation Act, 1957
(j)if he is retained or employed in any professional capacity either personally or in the name of a firm of which he is a partner or with which he is engaged in a professional capacity, in connection with any cause or proceeding in which the [a Corporation] [Substituted by Delhi Act 12 of 2011, section 2(a), "for the Corporation" (w.e.f. 13-1-2012).] or any of the municipal authorities is interested or concerned;