Section 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.