Now that we have defined a service contract interface, we need to implement it. For this purpose we will reuse the empty class file that Visual Studio created for us earlier, and modify this to make it the implementation class of our service.
Before we modify this file, we need to rename it. In the Solution Explorer window, right-click on the file, Class1.cs, select rename from the context menu, and rename it
Visual Studio is smart enough to change all the related files which are references to use this new name. You can also select the file and change its name from the Properties window.
Next, follow the steps below to customize this class file.