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WCF service interface should be decorated with ServiceContract attribute to mark this as the service that is exposed.
(Make sure, 'Show processes from all users' is checked)
Reason 2: Entity Framework was unable to make a connection to the database.
After searching the net for a while, I got a solution which I will share with you all to make your life easier.
data on a page, from database.
In the Add Application dialog box, name your service TestAPI and provide a path to the Visual Studio project's root path as shown below.
It showed me a screen with a small WiFi bar indicating that I am connected.
(Client can easily identify that call was successful or not)
Error message from the provider: The RSA key container could not be opened.