如何续订C#Windows应用程序?

HelloI have developed an POS using C# and SQL, i want to give it to different clients on rental basis let say for 3 months after three months application will fail to login if customer didnt pay rent, if customer pay rent then i will give him a key which he will enter to renew his app,please tell me how can i renew his application by any key, but i want that each time and for each customer key should be unique plz help as i am unable to do this.Regards 解决方案 这篇关于如何续订C#Windows应用程序?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！