对引用的误会-----一次出错引起的思考

        static void Main(string[] args)
        {
            Student s1 = new Student();
            s1.age = 10;
            s1.name = "小A";

            ChageS(s1);
            Console.WriteLine("修改后年龄：{0}", s1.age);//猜一下结果是10 还是20呢

            Console.Read();
        }

        static void ChageS(Student s)
        {
            Student ss = new Student();
            ss.age=20;
            ss.name="小B";
            s = ss;//s对ss的实例引用了吗？
        }
    }
    class Student
    {
        public int age;
        public string name;
    }