How CLR know class of Main() if we save with diifernt name

Question

I want know how CLR know class name of the Main method which we save with different name .

Vulpes · Answer

When the C# compiler compiles an exe file one of the first things it does is to look for a static Main method which satisifies the conditions for an entry-point i.e. it has a return type of void or int and either takes no parameters or a single parameter of type string[]. If it doesn't find such a method then it will issue an error. If it finds two or more such methods then it will also issue an error unless the /main compiler switch has been set to determine which one is to be used as the entry-point to the application. Having successfully determined the Main method the compiler inserts an .entrypoint IL directive as its first line. A MethodDef token for the Main method is also inserted in the EntryPointToken field of the CLR runtime header (part of the PE file header) so that the CLR will know where to start executing the assembly.