Common WCF Exception : Connection Unexpectedly Closed

Question

I have three projects. One is a WCF Services Project, one is a WPF Project, and one is a Microsoft Unit Testing Project. I setup the WCF Services project with a data object th

Answer 1

Another reason: This exception comes up if you have DataContract/DataMember attributes on an Interface instead of a concrete type (terrible idea, don't do it) and you are trying to serialize the Concrete type.