public class DropDownViewModel
    {
        public ICollection<CarModelViewModel> Models { get; set; }

        public ICollection<CarYearViewModel> CarYears { get; set; }

        public ICollection<CarMakeViewModel> Makes { get; set; }

        public int SelectedModelId { get; set; }

        public int SelectedCarYearId { get; set; }

        public int SelectedMakeId { get; set; }
    }