multi client/server chat program in c#?

Question

the clients will be able to chat one-to-one and in group (temperately rooms) similar to Skype.

I will use the server to authorize the clients

my question is whic

Answer 1

Go with WCF, WCF is good in wrapping the hard stuff, it presents those on a silver plate for you, the developer letting you focus on your program's logic.

I'm sure WCF can satisfy your program needs and more.