using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var l = new List<ValueTuple<int, string>>()

        {new ValueTuple<int, string>(1, "N"), new ValueTuple<int, string>(1, "N"), new ValueTuple<int, string>(2, "N")};

        var t = l.ToList().Distinct();

        t.Dump();

        l.Dump();

    }

}