Its as it says you can't directly run a class library project.
You need to create a WinForms / WPF or ASP.NET project and reference your class library and implement what is required to run the code.
Lobster Thermidor aux crevettes with a Mornay sauce, served in a Provençale manner with shallots and aubergines, garnished with truffle pate, brandy and a fried egg on top and Spam - Monty Python Spam Sketch
A class library project creates a static or dynamic library, and contains classes and their associated methods and properties. In order to use these classes you need to create an executable which creates instances of the classes and calls their methods as appropriate. For a simple test of the classes you can just include them into your project.
One of these days I'm going to think of a really clever signature.
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