FTP 下载功能代码

FTP的下载功能代码，一个小方法代码

        public  void TestFTPDownload()
        {
            try
            {
                // go get the same code from edition 1
                FtpWebRequest request =
                    (FtpWebRequest)WebRequest.Create(
                    "ftp://ftp.oreilly.com/pub/examples/csharpckbk/CSharpCookbook.zip");

                request.Credentials = new NetworkCredential("anonymous", "hilyard@oreilly.com");
                using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
                {
                    Stream data = response.GetResponseStream();
                    string targetPath = "CSharpCookbook.zip";
                    if (File.Exists(targetPath))
                        File.Delete(targetPath);

                    byte[] byteBuffer = new byte[4096];
                    using (FileStream output = new FileStream(targetPath, FileMode.CreateNew))
                    {
                        int bytesRead = 0;
                        do
                        {
                            bytesRead = data.Read(byteBuffer, 0, byteBuffer.Length);
                            if (bytesRead > 0)
                            {
                                output.Write(byteBuffer, 0, bytesRead);
                            }
                        }
                        while (bytesRead > 0);
                    }
                }
            }
            catch (WebException e)
            {
                Console.WriteLine(e);
            }
        }