public void AddAgeCategory(String ageCategoryName, String minAge, String maxAge) { Int32 minAgeArgument = Converter.ConvertToInt32(minAge); Int32 maxAgeArgument = Converter.ConvertToInt32(maxAge); AgeCategory ageCategory = new AgeCategory(ageCategoryName, minAgeArgument, maxAgeArgument); _validator.Validate(ageCategory); _repository.AddItem(ageCategory); }