using System;

using System.Collections.Generic;

using System.IO;

​

public class Program

{

    public static void Main()

    {

        List<int> intList = new List<int> {1,2,3,4,5,6,7,8,9};

        Console.WriteLine("Hello World: {0}", intList.getRand());

    }

}

public static class ListExt {

    public static T getRand<T>(this List<T> list) {

        Random r = new Random();

        int randIndex = r.Next(list.Count - 1);

        return list[randIndex];

    }

}