public static FTPHelper FtpHepler()
{
var serverAddr = ConfigurationManager.AppSettings["serverAddr"].ToString();
var serverPort = Convert.ToInt32(ConfigurationManager.AppSettings["serverPort"]);
var userName = ConfigurationManager.AppSettings["userName"].ToString();
var passWord = ConfigurationManager.AppSettings["passWord"].ToString();
var file=ConfigurationManager.AppSettings["file"].ToString();
FTPHelper helper = new FTPHelper(serverAddr, file, userName, passWord);
return helper;
}