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

namespace ConsoleApplication4
{
  
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                FileStream fs = new FileStream(@"d:\hh.txt", FileMode.OpenOrCreate, FileAccess.Read);
                byte[] hh = new byte[6] { 65, 66, 67, 68, 69, 70 };
                foreach (byte b in hh)
                {
                    fs.WriteByte(b);
                }
                fs.Position = 0;
                for (int i = 0; i < fs.Length; i++)
                {
                    Console.Write((char)fs.ReadByte());
                    fs.Close();
                }
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
            finally
            {
                System.Threading.Thread.Sleep(1111111111);
            }
        }
    }
}
流不支持写入
应该怎么修改？？？

FileAccess.ReadWrite