using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<string> Lst1 = new List<string>();

            Lst1.Add("a");

            Lst1.Add("ab");

            Lst1.Add("c");

            Lst1.Add("d");

​

            var result = Lst1.Select((v, i) => new { Value = v, Index = i });

​

            foreach (var item in result)

            {

                Console.WriteLine("Value: {0}, Index : {1} ", item.Value, item.Index);

            }

    }

}