Program.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HelloOrcas
{
    class Program
    {
        static void Main(string[] args)
        {
            "Hello, Orcas!".Print();
        }
    }

    public static class StringExtensions
    {
        public static void Print(this string message)
        {
            Console.WriteLine(message);
        }
    }
}