Extension Methods

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

static class Program
{
    static void Main()
    {

        string helloString = "Hello, Extension Methods!";

        int wordCount = helloString.WordCount();

        Console.WriteLine(wordCount);

    }
}


public static class StringExtensions

{

      public static int WordCount(this string str)

      {

            return str.Split(new char[] { ' ', '.', ',', '!'  },

                  StringSplitOptions.RemoveEmptyEntries).Length;

      }

}