fcbb435a_ofessional_Growth__Leadership___Description
[Title] One-Way Calls [Category] Operations [Last Updated] 9/7/2006 [Description] 
All WCF bindings support one-way calls – the ability to fire and forget a method. Simply set the IsOneWay property of the OperationContract attribute to true. However, as The download demonstrates, one-way calls do not equate asynchronous calls, or even concurrent calls - because the calls are queued up on the service side, the client may still block, as a product of concurrency mode, the instance mode, the binding and the reliable session.
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