private long GetContentLengthFrom213Response(string responseString)
{
string[] parsedList = responseString.Split(new char[] { ' ' });
if (parsedList.Length < 2)
throw new FormatException(SR.Format(SR.net_ftp_response_invalid_format, responseString));
return Convert.ToInt64(parsedList[1], NumberFormatInfo.InvariantInfo);
}