using System;

using System.Collections;

using System.Linq;

public class Program

{

    public static IEnumerable SomeEnumerable()

    {

        for(var i = 0; i < 10; i++)

        {

            Console.WriteLine("Yielded enumeration index: " + i);

            yield return i;

        }

    }   

    public static void Main()

    {

        var list = SomeEnumerable();

        foreach(var rowObject in list.Cast<object>().Select((r, i) => new {Row=r, Index=i}))

        {

            var row = rowObject.Row;

            var i = rowObject.Index;

        }       

    }

}