private void GetYears(int RefCarModelId)
        {
            tmpCarGenerationList = CarGenerations.GetByRefCarModelId(RefCarModelId);
            CarTrimList.Clear();
            foreach (var item in tmpCarGenerationList)
            {
                var tmp = CarTrims.GetByRefCarGenerationId(item.CarGenerationId);
                foreach (var trim in tmp)
                {
                    tmpCarTrimList.Add(trim);
                }
            }
            var tmpYears = tmpCarTrimList.Select(x => x.Year).ToList();

            tmpYears.Sort();
            Years = tmpYears.Distinct().ToSvenTechCollection();
            CarGenerationList.Clear();
        }
 private void GetCarTrims()
 {
     CarTrimList = CarTrims.GetByRefCarGenerationId(selectedCarGeneration.CarGenerationId).Where(x => x.Year == selectedYear && x.RefCarBodyId == selectedCarBody.CarBodyId).ToSvenTechCollection();
     CarEngine   = null;
 }