C# 文件操作方法

            FileStream textFile = File.Open(@"F:\程序\新手测试\linqApplication1\linqApplication1\IO.txt", FileMode.Append);
            StreamWriter sw = new StreamWriter(textFile);
            sw.WriteLine("11111");
            sw.WriteLine();
            sw.Close();

            FileStream textFile = File.Open(@"F:\程序\新手测试\linqApplication1\linqApplication1\IO.txt", FileMode.Append);
            byte[] info = Encoding.Default.GetBytes("11111");
            textFile.Write(info, 0, info.Length);
            textFile.Close();