C#中自己创建一个类，在该类中创建一个方法，在该方法之外创建一个该类的对象，该对象为何不能引用该方法？如下代码

class XiaoFei
    {
        XiaoFei jilu = new XiaoFei();
        jilu.xiaofei();
         void xiaofei()
        {
            Console.WriteLine("信用卡消费记录\n");
            Card pcard = new Card() { Money = "8000" };
            Console.WriteLine("信用卡总额度:"+pcard.Money+"\n");
            Card scard = pcard;
            scard.Money = "3000";
            Console.WriteLine("信用卡消费记录：" + pcard.Money + "\n");
            Console.Read();
        }
    }