Question: I am working on a large system, for which I have to use WCF to access a web service. My test code works fine, now I need to integrate my WCF client code into the larger system. I cannot add to the existing 'app.config' file, and would like specify a separate .config file for use by my client code.

How best can I accomplish this?

Thanks!

Answer: 
There is no built-in support for this in WCF unfortunately. You must create your own ChannelFactory subclass and load/parse configuration files yourself. Check out [this post](http://social.msdn.microsoft.com/forums/en-US/wcf/thread/f33e620a-e332-4fd4-ae21-88c750437355/) here on MSDN forums for more implementation details.
So the option mentioned by marc\_s **DOES** work. Ignore Visual Studio warning that it doesn't recognize the configSource property on bindings and all other places.