What do I do if I just want to create a project which contains a bunch of library functions? In other words no Main method is required. It seemed to be compiling a minute ago and then I added another .cs file and now I am confronted with this error message.
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Create a .NET Class Library project if you only want a library project. If this is a project that already exists, you can set the Project Output type to a DLL (“Class Library“) instead of an Executable (“Windows Application“/”Console Application“) in the project properties.