>A teacher told me that vfp is not a object oriented language, because it has not a constructor and a destroyer, it is true?
>vfp is not a OO Language, like vb.net o c#?

Your teacher is full of baloney. Having constructors and destructors is not the definition of OOP. The three core features are inheritance, encapsulation, and polymorphism. VFP has all three and was there way ahead of VB.