WCF Web service is active or not in Client Application

Hi,

1. Another option you can use wcftestclient which is Test Client (WcfTestClient.exe) is a GUI tool that enables users to input test parameters, submit that input to the service, and view the response that the service sends back. It provides a seamless service testing experience when combined with WCF Service Host. 

2. You can have a method called ping to verify your WCF service is up and running. You can call that to make sure your service up and runnning. 

Hope it will help. 

You can invoke any method at client application.

Or if you are looking for something more advanced go for service discovery. Here is implementation https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/wcf-discovery-overview