using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static List<Tuple<string, int>> myGrid = new List<Tuple<string, int>>();

    public static void Main()

    {

        for (int i = 0; i < 100; i++)

            myGrid.Add(new Tuple<string, int>("Item" + i.ToString(), i));

        var index = myGrid.FindIndex(0, t => t.Item2 == 15);

        Console.WriteLine(index);

        index = myGrid.FindIndex(0, t => t.Item1 == "Item15");

        Console.WriteLine(index);

    }

}