public struct UniqueId : IEquatable<UniqueId>
    {        
        public long Part1 { get; }

        public long Part2 { get; }

        public long Part3 { get; }

        public UniqueId(long part1, long part2, long part3)
        {
            Part1 = part1;
            Part2 = part2;
            Part3 = part3;
        }

        public override string ToString() => $"{Part1}.{Part2}.{Part3}";

        public bool Equals(UniqueId other) =>
            Part1 == other.Part1 && Part2 == other.Part2 && Part3 == other.Part3;

        public override bool Equals(object obj) =>
            obj is UniqueId other && Equals(other);

    }

static void Main(String[] args) 
        { 
             UniqueId uniqueId1 = new UniqueId((long)111, (long)222, (long)333);
             UniqueId uniqueId2 = new UniqueId((long)444, (long)555, (long)666);
             Console.WriteLine(uniqueId1.Equals(uniqueId2));
             Console.ReadLine();   
        }