WCF Test Client is a GUI tool which enables us to enter parameters, invoke services with these parameters and view the responses returned by services.
After you create a new WCF service project and press F5 to start the debugger, the WCF Service Host begins to host the service in your project. Then, WCF Test Client opens and displays a list of service endpoints defined in the configuration file. You can test the parameters and invoke the service, and repeat this process to continuously test and validate your service.
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Source: MSDN | |