try
                   {
                       FTPFactory ftpfactory = new FTPFactory();
                       ftpfactory.login();
                       ftpfactory.setBinaryMode(true);
                       string[] a = ftpfactory.getFileList(@"\Update");

                       ftpfactory.download(a[0].ToString(), Application.StartupPath + "\\123.txt", true);
                   }
                   catch(Exception ex)
                   {
                       MessageBox.Show(ex.Message,"提示");
                   }