/// <summary>
        /// Maps object data from <see cref="VacationDto"/> to <see cref="Vacation"/>.
        /// </summary>
        /// <param name="vacation">The <see cref="Vacation"/> instance containing data.</param>
        /// <returns>The <see cref="Vacation"/> instance.</returns>
        public Vacation MapTo(Vacation entity = null)
        {
            Vacation vacation = entity;

            if (vacation == null)
            {
                vacation = new Vacation();
            }

            vacation.ID             = ID;
            vacation.DateFrom       = DateFrom.GetValueOrDefault();
            vacation.DateTo         = DateTo.GetValueOrDefault();
            vacation.TypeID         = Type.GetValueOrDefault();
            vacation.StatusID       = Status.GetValueOrDefault();
            vacation.AvailabilityID = Availability.GetValueOrDefault();
            vacation.Active         = Active.GetValueOrDefault();

            return(vacation);
        }