变量的作用域

namespace ConsoleApplication3
{
    class Program
    {
        static void write()
        {
            string mystring = "string defined in wrtie()";
            Console.WriteLine("now in write()");
            Console.WriteLine("mystring={0}", mystring);
        }

        static void Main(string[] args)
        {
            string mystring = "string defined in Main()";
            write();
            Console.WriteLine("\nnow in Main()");
            Console.WriteLine("mystring={0}", mystring);
            Console.ReadKey();
        }
    }
}