Cursor currentCursor = this.Cursor;
            FtpWebResponse respons = null;
            Stream stream = null;
            try
            {
                this.Cursor = Cursors.WaitCursor;
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(textBox1.Text);
                request.Credentials = new NetworkCredential(textName.Text, textPwd.Text);
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                respons = (FtpWebResponse)request.GetResponse();
                stream = respons.GetResponseStream();
                FillDirectoryList(stream);
                serverDirecftory = null;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "error Ftp Client", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }
            finally
            {
                if (respons != null)
                    respons.Close();
                if (stream != null)
                    stream.Close();
                this.Cursor = currentCursor;
            }

        }

 FtpWebResponse response = null;
            Stream stream = null;
            try
            {
                string subDir = listBox1.SelectedValue.ToString().Trim();
                serverDirecftory += "/" + subDir;
                Uri baseUri = new Uri(textBox1.Text);
                Uri uri = new Uri(baseUri, serverDirecftory);
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
                request.Credentials = new NetworkCredential(textName.Text, textPwd.Text);
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                response = (FtpWebResponse)request.GetResponse(); stream = response.GetResponseStream();
                FillDirectoryList(stream);
                //serverDirecftory = null;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "error Ftp Client", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }
            finally
            {
                if (response != null)
                    response.Close();
                if (stream != null)
                    stream.Close();
            }

private void Upload(string filename) 
  { 
   FileInfo fileInf = new FileInfo(filename); 
   string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name; 
   FtpWebRequest reqFTP; 
   
   // 根据uri创建FtpWebRequest对象 
   reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name)); 
   
   // ftp用户名和密码 
   reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); 
   
   // 默认为true，连接不会被关闭 
   // 在一个命令之后被执行 
   reqFTP.KeepAlive = false; 
   
   // 指定执行什么命令 
   reqFTP.Method = WebRequestMethods.Ftp.UploadFile; 
   
   // 指定数据传输类型 
   reqFTP.UseBinary = true; 
   
   // 上传文件时通知服务器文件的大小 
   reqFTP.ContentLength = fileInf.Length; 
   
   // 缓冲大小设置为2kb 
   int buffLength = 2048; 
   
   byte[] buff = new byte[buffLength]; 
   int contentLen; 
   
   // 打开一个文件流 (System.IO.FileStream) 去读上传的文件 
   FileStream fs = fileInf.OpenRead(); 
   try 
   { 
   // 把上传的文件写入流 
   Stream strm = reqFTP.GetRequestStream(); 
   
   // 每次读文件流的2kb 
   contentLen = fs.Read(buff, 0, buffLength); 
   
   // 流内容没有结束 
   while (contentLen != 0) 
   { 
   // 把内容从file stream 写入 upload stream 
   strm.Write(buff, 0, contentLen); 
   
   contentLen = fs.Read(buff, 0, buffLength); 
   } 
   
   // 关闭两个流 
   strm.Close(); 
   fs.Close(); 
   } 
   catch (Exception ex) 
   { 
   MessageBox.Show(ex.Message, "Upload Error"); 
   } 
  }