A service interface is a component of a Visual Studio project. For these tutorials, you'll create one Visual Studio Solution to contain your service interfaces projects -- one for each tutorial.
Visual Studio opens the Solution Explorer for the SVITutorials solution, showing the SVITutorials project. Because each service interface created in a tutorial uses a different enterprise server, and enterprise servers are associated at the project level, each service interface must be in its own project. Therefore, we will not use the default SVITutorials project but instead will create a separate project within the SVITutorial Solution for each tutorial.