New York Consolidated Laws, County Law - CNT § 402. Oath of office

Every officer paid his compensation from county funds shall take and file an official oath in the manner prescribed in section ten of the public officers law.  The refusal or neglect to take and file such oath within the time prescribed by section thirty of the public officers law, except in the cases of the sheriff, county clerk and district attorney, shall be deemed a refusal to serve and the office may be filled as in the case of a vacancy.  Until the sheriff, county clerk or district attorney shall take and file the required oath, he shall not perform any duties of the office, nor be entitled to any compensation.