using System;

using System.Collections.Generic;

using System.Data;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var t1 = Tuple.Create<int, string>(1, "abc123");

        var t2 = Tuple.Create<int, string>(1, "abc123");

        List<Tuple<int,string>> list = new List<Tuple<int,string>> { t1, t2 };

        Console.WriteLine(list.Contains(new Tuple<int, string>(1, "abc123")));

    }

}