IRC library in C#

Two years later, now there's ircdotnet which seems to work pretty well.

Should note that this does not yet (and will likely never) work for Windows 8 Metro-style (WinRT) apps.

There is a bunch of IRC libraries on Codeplex, one of them which seems quite good is Nebo IRC: http://nebo.codeplex.com/

Some other IRC libraries on Codeplex: http://www.codeplex.com/site/search?projectSearchText=IRC

I think the protocol is so simple you probably could do it yourself then. Really, I've tested some years ago using simply telnet! I'd get the source of some simple client and just implement the same commands.

You can refer to: http://www.irchelp.org/irchelp/rfc/rfc.html