namespace WPF_1_Start.Models; public class RoomId { public int? FloorNumber { get; } public int? RoomNumber { get; } public override bool Equals(object? obj) { return obj is RoomId roomId && FloorNumber == roomId.FloorNumber && RoomNumber == roomId.RoomNumber; } public override int GetHashCode() { return HashCode.Combine(FloorNumber, RoomNumber); } public override string ToString() { return $"{FloorNumber}{RoomNumber}"; } }