4 (Main)

This is an entry point for our program. At least one Main method is required for our C# program, and it should be static. We will discuss static in detail in the upcoming section, Overview of C# reserved keywords. Main is also a reserved keyword.

An entry is a way that lets CLR know the what and where of the functions located in the DLL. For instance, whenever we run our console application, it tells CLR that Main is the entry point and everything surrounds here. For more details, refer to https://docs.microsoft.com/en-us/dotnet/framework/interop/specifying-an-entry-point and https://docs.microsoft.com/en-us/dotnet/framework/interop/specifying-an-entry-point.