public class FtpHelper    {         /// <summary>        /// ftp方式上传         /// </summary>        public static int UploadFtp(string filePath, string filename, string ftpServerIP, string ftpUserID, string ftpPassword)        {            FileInfo fileInf = new FileInfo(filePath + "\\" + filename);            string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;            FtpWebRequest reqFTP;            // Create FtpWebRequest object from the Uri provided             reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));            try            {                // Provide the WebPermission Credintials                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                 // By default KeepAlive is true, where the control connection is not closed                 // after a command is executed.                 reqFTP.KeepAlive = false;                 // Specify the command to be executed.                 reqFTP.Method = WebRequestMethods.Ftp.UploadFile;                 // Specify the data transfer type.                 reqFTP.UseBinary = true;                 // Notify the server about the size of the uploaded file                 reqFTP.ContentLength = fileInf.Length;                 // The buffer size is set to 2kb                 int buffLength = 2048;                byte[] buff = new byte[buffLength];                int contentLen;                 // Opens a file stream (System.IO.FileStream) to read the file to be uploaded                 //FileStream fs = fileInf.OpenRead();                 FileStream fs = fileInf.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);                 // Stream to which the file to be upload is written                 Stream strm = reqFTP.GetRequestStream();                 // Read from the file stream 2kb at a time                 contentLen = fs.Read(buff, 0, buffLength);                 // Till Stream content ends                 while (contentLen != 0)                {                    // Write Content from the file stream to the FTP Upload Stream                     strm.Write(buff, 0, contentLen);                    contentLen = fs.Read(buff, 0, buffLength);                }                 // Close the file stream and the Request Stream                 strm.Close();                fs.Close();                return 0;            }            catch (Exception ex)            {                reqFTP.Abort();                //  Logging.WriteError(ex.Message + ex.StackTrace);                return -2;            }        }         /// <summary>        /// ftp方式下载         /// </summary>        public static int DownloadFtp(string filePath, string fileName, string ftpServerIP, string ftpUserID, string ftpPassword)        {            FtpWebRequest reqFTP;            try            {                //filePath = < <The full path where the file is to be created.>>,                 //fileName = < <Name of the file to be created(Need not be the name of the file on FTP server).>>                 FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                reqFTP.UseBinary = true;                reqFTP.KeepAlive = false;                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();                Stream ftpStream = response.GetResponseStream();                long cl = response.ContentLength;                int bufferSize = 2048;                int readCount;                byte[] buffer = new byte[bufferSize];                 readCount = ftpStream.Read(buffer, 0, bufferSize);                while (readCount > 0)                {                    outputStream.Write(buffer, 0, readCount);                    readCount = ftpStream.Read(buffer, 0, bufferSize);                }                 ftpStream.Close();                outputStream.Close();                response.Close();                return 0;            }            catch (Exception ex)            {                // Logging.WriteError(ex.Message + ex.StackTrace);                // System.Windows.Forms.MessageBox.Show(ex.Message);                return -2;            }        }    }