C# extensions methods example

CSExtensionsMethods.cs

using System;
using System.Threading;

namespace FunctionalExperiments
{
    class Program
    {
        static void Main(string[] args)
        {
            SomeEmptyClass someObject = new SomeEmptyClass();
            someObject.NewEmptyMethod();
            string some = "aaaa";
            some.NewMethod();
            Console.ReadKey();
        }
              
    }

    public static class StringExtensions
    {
        public static void NewMethod(this String self)
        {
            Console.WriteLine("hello here, i am " + self);
        }
    }

    public static class SomeEmptyClassExtensions
    {
        public static void NewEmptyMethod(this SomeEmptyClass self)
        {
            Console.WriteLine("hello here");
        }
    }

    public class SomeEmptyClass
    {

    }
}