Often not, you have a Windows Communication Foundation (WCF) service ready for call but do not have a ready service controller or UI to execute testing on it.
Scenario: While I was working on developing front-end of the system that calls a fully developed back-end UI, my software tester requested for assistance in testing the back-end service. (Back then, it was a parallel ongoing work where once software developer completed the back-end service, software developer will proceed with front-end while software tester will do testing on the back-end service)
In order to solve this issue, you just need to run WCF Test Client.
Method 1: Command Prompt