using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public enum Test{

        A = 100,

        B = 200

    }

    public static void Main()

    {

        (Test test, int chargeId) tupleTestA = (Test.A, 100);

        (Test test, int chargeId) tupleTestB = (Test.B, 100);

        (Test test, int chargeId) tupleTestC = (Test.A, 200);

        var list = new List<(Test test, int chargeId)>();

        list.Add(tupleTestA);

        list.Add(tupleTestB);

        list.Add(tupleTestC);

        var listDistinct = list.Select(l => (l.test, l.chargeId)).Distinct().ToList();

        var x = list.Count();

        var y = listDistinct.Count();

        Console.WriteLine(x);

        Console.WriteLine(y);

    }   

}