Article 99 of Code of Civil Procedure

The plaintiff may discontinue the proceedings by notice served on his adversary, by an express statement in a memorandum signed by him or his representative and brought to his adversary's attention, or by making the request orally at the hearing and recording it in the minutes. Discontinuance after the defendant has presented his defence shall not be effected without his acceptance. Nevertheless, such acceptance shall not be required if he has pleaded that the court lacks jurisdiction, that the case should be referred to another court, that the statement of claim is void, that the case is inadmissible because it has previously been adjudicated, or any other pleas intended to prevent the court from proceeding with consideration of the action. Discontinuance shall entail an order requiring the discontinuing party to pay the costs.