using System;

using System.Collections.Generic;

using System.Linq;                  

​

public class Program

{

    public static void Main()

    {

        var items = new List<string>{

            "apple",

            "pen",

            "applepen",

            "pineapple"};

        var even = items.Where((item, index) => index % 2 == 0);

        foreach(var item in even){

            Console.WriteLine(item);

        }

    }

}