C#上傳檔案到ftp

private void UploadImg(string sFileDstPath, string FolderName, string ftpServerIP, string ftpUserName,string ftpPwd)
        {
            FileInfo fileInf = new FileInfo(sFileDstPath);

            FtpWebRequest reqFTP;

            reqFTP = (FtpWebRequest) FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/" +fileInf.Name));

            reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

            reqFTP.KeepAlive = false;

            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

            reqFTP.UseBinary = true;

            reqFTP.ContentLength = fileInf.Length;

            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            using (FileStream fs = fileInf.OpenRead())
            {
                using (Stream strm = reqFTP.GetRequestStream())
                {
                    contentLen = fs.Read(buff, 0, buffLength);
                    while (contentLen != 0)
                    {
                        strm.Write(buff, 0, contentLen);
                        contentLen = fs.Read(buff, 0, buffLength);

                    }
                    strm.Close();
                }
                fs.Close();
            }
        }