namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            MyClass s = new MyClass();
            s.val = 10;
            int i = 20;
            Console.WriteLine("s.val={0},i={1}",s.val,i);
            MyMethod(s, i);
            Console.WriteLine("s.val={0},i={1}", s.val, i);
            Console.Read();
        }
        static void MyMethod(MyClass f1,int f2)
        {
            f1.val = f1.val + 5;
            f2 = f2 + 5;
        }
    }
    class MyClass
    {
        public int val = 20;
    }
}

這裡順便介紹下棧和堆