WCF multiple threading

WCF doesn't support static method by design.

Refer to http://www.codeproject.com/Articles/89858/WCF-Concurrency-Single-Multiple-and-Reentrant-and

maxConcurrentCalls - Calls in excess of the limit are queued. refer to msdn http://msdn.microsoft.com/en-us/library/ms731379.aspx