A readable System.IO.Stream instance that contains data returned with the response; otherwise, System.IO.Stream.Null if no response data was returned by the server.
After reading the data, you must close the stream. The stream is automatically closed when you close the System.Net.FtpWebResponse object that contains it.
An exception is thrown unless the request method is System.Net.WebRequestMethods.Ftp.DownloadFile or System.Net.WebRequestMethods.Ftp.ListDirectory.