needless to say that in a suit for pre-emption, the vendor i.e., the owner of the suit land who had allegedly not given any notice of sale to the plaintiff as required to be given under Section 19 of the Pre-emption Act and against whom the right to pre-empt the sale is claimed would be a proper party if not a necessary party, for a complete and final adjudication on the issues involved in the suit. 13. As held by this Court in U.P. AwasEvamVikasParishad vs. Gyan Devi2, necessary party is one without whom no order can be made effectively; and a proper party is one in whose absence an effective order can be made but whose presence is necessary for a complete and final decision on the question involved in the proceedings. When a right to pre-empt the sale was claimed by the plaintiff Jagtar Singh as a co-sharer in the lands along with the owner Jit Singh, alleging that the mandatory provisions contained in Section 19 i.e., for giving notice to the pre-emptor, was not complied with by the owner or seller Jit Singh, his presence as the party defendant was desirable along with the other defendants Jhabbar Singh and Others, to effectively and finally decide the disputes between the parties. Though, Order I, Rule 9 states that no suit shall be defeated by reasons of the misjoinder or non-joinder of parties, care must be taken by the court to ensure that all the parties, be it the plaintiff or the defendant, whose presence is necessary for complete and final adjudication on the issues involved in the suit, are before the court. That is the reason why the courts are empowered to strike out or add parties, at any stage of the proceedings as per Order I, Rule 10, C.P.C.