using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(" -- No Arguments --");

        MethodWithDefaultArguments();

        Console.WriteLine();

        Console.WriteLine(" -- Arguments in order --");

        MethodWithDefaultArguments(null, "sup");

        Console.WriteLine();

        Console.WriteLine(" -- Named arguments --");

        MethodWithDefaultArguments(thing: "New");

        Console.WriteLine();

    }

    public static void MethodWithDefaultArguments(object obj = null, string str = null, string thing = "Default")

    {

        Console.WriteLine("obj: Passed " + (obj != null ? "an object" : "null :("));

        Console.WriteLine("str: Passed " + (obj != null ? str : "null :("));

        Console.WriteLine("thing: Passed " + (thing != null ? "an object" : "null :("));

    }

}