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();