1. Read YM API documentation here http://developer.yahoo.com/messenger/guide/
2. Use HttpWebRequest to send API command and receive API result

The API is a REST, that means you can handle it like common URL. You can even access the API directly from your browser.

Thx
~jimmi

Jimmi_K is correct... I'm currently using C#/.NET 3.5 wiih Visual Studio, The whole YIM API/SDK is able to make the bridge between connecting of your Standalone App (.EXE, binary) with the YIM platform (YIM's chat servers and other network infrastructure)....

MCTS, I'm currently programming/coding a C#/.NET YIM client, which can then be used to automate many YIM processes like a BOT, or many many other things too.If you'd like to check it out (w/full source code and project files). Hit me up or email me: sales@data4marketers.com if you'd like to check it out.

Thanks,
-James
www.data4marketers.com

Is there a C# library to use for Windows Phone? I'd like to build a WP app, using all the available features. The C# code and examples I've seen are mainly for desktop and the WP API is not a 1:1 match.