Courts have to allow amendments if petitions under Order VI Rule 17 of CPC are filed before commencement of trial. If petitions are filed after commencement of trial, the petitioners have to show that amendment petition could not be filed in spite of exercise of due diligence. Here, the petitioner explained the reason for his failure to amend the plaint, more particularly based on the subsequent events that took place after the death of the original 1st defendant i.e., partition and execution of release deed by his mother, sisters and brothers. However, it is clear from the material on record that the incident of partition of the property and execution of release deed by the mother, sisters and brothers of the petitioner is a subsequent event after the death of the original 1st defendant. Such fact can be brought on record by following the procedure under Order VIII Rule 9 of CPC but not under Order VI Rule 17 of CPC. The reasoning recorded by trial Court that the petitioner did not explain the due diligence he exercised in taking steps to amend the written statement appears to be correct, but dismissal of petition on the ground that it is filed after commencement of trial is not sufficient cause, both exercise of diligence and commencement of trial are interlinked. Amendment can be allowed after commencement of trial only when the petitioner is able to establish that he exercised due diligence, despite it he could not take steps to get the written statement amended. However, the alleged partition etc., is a subsequent event, such event can be brought on record by following Order VIII Rule 9 of CPC but not under Order VI Rule 17 of CPC. On this ground alone, the petition is not maintainable, and at best, it is open to the petitioner to file a petition under Order VIII Rule 9 of CPC to bring the subsequent events on record after obtaining leave of the Court as required under Order VIII Rule 9 of CPC. Therefore, I find no illegality in exercise of discretion or failure to exercise discretion, which vested on the trial Court in dismissing the petition, warranting interference of this Court exercising the jurisdiction under Article 227 of the Constitution of India. Hence, I