// Extensions.cs - Demonstrates extension methods

using System;

​

void SurprisinglyValid(string firstParam)

{

}

​

// Static class for extension methods

public static class StringExtensions

{

    public static void Main()

    {

    }

​

    // Extension method to count words in a string

    public static int CountWords(this string text) => string.IsNullOrWhiteSpace(text) ? 0 : text.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Length;

}