C#面向对象 类的封装

 class student
    {
        public int _code;
        public int Code//属性
        {
            //获取值
            get
            {
                return 5;
            }
            //设置值
            set
            {
                _code = value + 9;
            }
        }
        private string _name;
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }   
    }

student s = new student();
            s.Code = 3;
            Console.WriteLine(s.Code);
            Console.WriteLine(s._code);
            Console.ReadLine();