Yahoo Chat Client in C#

I want to buy routines to do a Yahoo chat client in C#. Buddy list retrieval and presence detection, chatting (send/recieve) and status change. The GUI is not important other than is enough to show API works. I only want people to bid who have already done this and can deliver almost instant delivery. A working demo should be added to bid to prove you have done this. C# only. Please dont Bid to much and Bid Accordingly ! Thanks!