The .NET Framework provides comprehensive support for the FTP protocol with the FtpWebRequest and FtpWebResponse classes. These classes are derived from WebRequest and WebResponse. In most cases, the WebRequest and WebResponse classes provide all that is necessary to make the request, but if you need access to the FTP-specific features exposed as properties, you can typecast these classes to FtpWebRequest or FtpWebResponse.
For more information, see the following topics: How to: Download Files with FTP, How to: Upload Files with FTP, and How to: List Directory Contents with FTP.
If a proxy (specified by the Proxy property) is an HTTP proxy, then only the DownloadFile, ListDirectory, and ListDirectoryDetails commands are supported.