你是否曾经为要做一个试用软件而苦苦写很多代码，这个控件为你解决了写共享软件的麻烦，它可以把你的软件加一把锁，让用户注册，在规定期限内如果用户不注册就会不能试用或丧失一些功能。-Do you have to do a lot of trial software, which are hard to write code, this control is for you to solve the trouble to write-sharing software, which can put you