Trivia.cs

public class Foo : BaseClass { }

public class Bar : BaseClass
{
    public Bar() : base() { } 
}

public class BaseClass
{       
    public BaseClass([CallerMemberName] string val = "Foo")
    {
        Console.WriteLine(val);
    }
}

class Program
{
    static void Main(string[] args)
    {
        new Foo(); // Prints Foo
        new Bar(); // Prints .ctor
    }
}