If you are looking for a free network library for
the .NET platform then you may wish to look at
BytesRoad.NetSuit library. This is an open source
network library completely written in C#. You may find
it useful if you would like to insert support for
communication with FTP servers in your application.
FTP support implemented in the library is very
powerful as it is compliant with RFC 959 (File
Transfer Protocol) and includes the ability to
communicate with FTP servers through the various
proxies (such as Socks4, Socks4a, Socks5, HTTP
CONNECT). The capability of communication with FTP
servers though the proxies depends on another set of
classes exposed by the library. You may also use these
classes in your application to implement low level
network communication with remote computers through
the proxies.

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