I'll try to explain this with an example. I'm writing a chat application. There are users that can join chat rooms. A user has to log in before he can join any room.

Currently, there is a single service. A user logs in using this service. Then, the user sends and receives messages for all joined rooms via this single service.

channel.Login("Hans Moleman", "password");
channel.JoinRoom("name of room");
channel.SendChat("name of room", "hello");

I'm thinking about changing the design so there is a new WCF connection for each joined room. In the actual app, the number of connections is likely going to be in the range of 10-100, possibly more.

Is this a good idea? Or are ~100 connections per client too much? The server should be able to handle many clients (range 100-1000, later up to 10k). In case it matters, I'm using NetTcpBinding.