// as seen here

// https://stackoverflow.com/a/45594089/10870835

// (c) dbj@dbj.org licesne CC BY SA 4.0

using System;

using System.Runtime.CompilerServices;

// defined bellow

using static my.notmacros;

​

namespace my

{

    public struct notmacros

    {

        [MethodImpl(MethodImplOptions.AggressiveInlining)]

        public static string whoami([CallerMemberName] string caller_name = null)

        {

            if (string.IsNullOrEmpty(caller_name))

                return "unknown";

            if (string.IsNullOrWhiteSpace(caller_name))

                return "unknown";

            return caller_name;

        }

    }

} // my namespace

​

public class Program

{

    public static void Main()

    {

        // this is called from main thus the result is "Main"

        var my_name = whoami();

        Console.WriteLine("Hello from {0}", my_name);

    }

}