Class C# Tutorial

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
    public static class ExtensionLibExtensions
    {
        public static string ReverseString(this string inputString)
        {
            return new string(inputString.ToCharArray().Reverse().ToArray());
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            string sourceString = "this is a test";
            Console.WriteLine("String backwards: {0}", sourceString.ReverseString());
        }
    }