https://rein.kr/posts/2009-02-12-c-%EA%B0%9D%EC%B2%B4%EC%97%90-%ED%9D%94%ED%9E%88-initializefinalize-%EA%B0%99%EC%9D%80-%ED%95%A8%EC%88%98%EA%B0%80-%EC%9E%88%EB%8A%94-%EC%9D%B4%EC%9C%A0/