System.Net.FtpControlStream.GetContentLengthFrom213Response C# (CSharp) Method

        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);
        }