Basic tasks to create and consume WCF SERVICE

Define the service contract. A service contract specifies the signature of a service, the data it exchanges, and other contractually required data.
Implement the contract. To implement a service contract, create the class that implements the contract and specify custom behaviors that the runtime should have.
Configure the service by specifying endpoint information and other behavior information.
Host the service in an application.
Build a client application.

For more information visit below link http://msdn.microsoft.com/en-us/library/ms732098.aspx

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