using System;

namespace ExperimentProject
{
    public class Program
    {
        public abstract class MyId
        {
            public abstract int Value { get; set; }

            public static bool operator ==(MyId a, MyId b)
            {
                if (a.GetType() != b.GetType())
                    return false;
                if (a.Value == b.Value)
                    return true;
                return false;
            }

            public static bool operator !=(MyId a, MyId b)
            {
                return !(a == b);
            }
        }

        public class MyId1 : MyId
        {
            public MyId1(int id)
            {
                Value = id;
            }

            public override int Value { get; set; }
        }

        public class MyId2 : MyId
        {
            public MyId2(int id)
            {
                Value = id;
            }

            public override int Value { get; set; }
        }

        public static void Main()
        {
            var q1 = new MyId1(2);
            var q2 = new MyId1(2);
            var q3 = new MyId2(2);

            bool f1 = q1 == q2;
            bool f2 = q1 == q3;

            Console.WriteLine(f1); //true
            Console.WriteLine(f2); //false
        }
    }
}