How do you call functions from main program from a class library in C#?

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C#

I want to allow the user to code for my application by using a template project that compiles into a DLL file that the main program will look for.

Lets say I have:
mainapp.exe
userscode.dll
And all of the other DLLS that C# generates.

In mainapp.exe, there would be a function like:

namespace MyApp {
    class ThisClass {
        public static void CallThisFunctionExternally()
        {
            Console.WriteLine("This function has been called by the User's DLL file!")
        }
    }
}

and the user's code would be:

namespace UsersCode {
    class UserClass {
         public static void CallMainFunction()
         {
             //Load main program's namespace
             MyApp.ThisClass.CallThisFunctionExternally();
         }
    }
}

I don't want the code to run on the DLL, I want it to run as if it were called from inside the main program.

Thank you!



I've tried to use `Assembly.LoadFrom(path)` but I couldn't figure out how to use it and I'm not sure it would do what I want.

What I have tried:

I've tried to use Assembly.LoadFrom(path) but I couldn't figure out how to use it and I'm not sure it would do what I want.