C#读写文件流方法

        static void Main(string[] args)
        {
            //C#文件流写文件,默认追加FileMode.Append 
            string msg = "okffffffffffffffff";
            byte[] myByte = System.Text.Encoding.UTF8.GetBytes(msg);
            using (FileStream fsWrite = new FileStream(@"D:\1.txt", FileMode.Append))
            {
                fsWrite.Write(myByte, 0, myByte.Length);
            }; 
            //c#文件流读文件 
            using (FileStream fsRead = new FileStream(@"D:\1.txt", FileMode.Open))
            {
                int fsLen = (int)fsRead.Length;
                byte[] heByte = new byte[fsLen];
                int r = fsRead.Read(heByte, 0, heByte.Length);
                string myStr = System.Text.Encoding.UTF8.GetString(heByte);
                Console.WriteLine(myStr);
                Console.ReadKey();
            } 
        }