全局变量和局部变量的理解

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static string mm;
        static void Write()
        {
            string mm = "大家好，我是方法！";
            Console.WriteLine("现在我在方法Write()里面！");
            Console.WriteLine("局部变量{0}",mm);
            Console.WriteLine("全局变量{0}",Program.mm);
        }
        static void Main(string[] args)
        {
            string mm = "大家好，我是方法！！！在Miain里面的！";
            Program.mm = "我是全局变量";
            Write();//调用方法
            Console.WriteLine("在Main里面");
            Console.WriteLine("局部变量mm={0}",mm);
            Console.WriteLine("全局变量mm = {0}",Program.mm);
            Console.ReadKey();

        }
    }
}