PreserveIds using inheritance id db auto incrementing

I am working on this project where I like to PreserveIds once inserted into the database. The id are auto incrementing and I return them once the data in inserted. I like to know if there is a better way using inheritance vs using a for each loop and checking if the value is 0?

 class Program
    {
        static void Main(string[] args)
        {
            var States = new List<StatesModel>();
            var CaliforniaCity = new List<CityModel>();
            CaliforniaCity.Add(new CityModel() { Id = 2, Name = "Los Angeles" });
            CaliforniaCity.Add(new CityModel() { Id = 3, Name = "Sacramento" });
            CaliforniaCity.Add(new CityModel() { Id = 4, Name = "San Francisco" });
            States.Add(new StatesModel() { Id = 1, Name = "California", CityModels = CaliforniaCity });

            var PhiladelphiaCity = new List<CityModel>();
            PhiladelphiaCity.Add(new CityModel() { Id = 5, Name = "Philadelphia" });
            PhiladelphiaCity.Add(new CityModel() { Id = 6, Name = "Pittsburgh" });
            PhiladelphiaCity.Add(new CityModel() { Id = 7, Name = "Harrisburg" });
            States.Add(new StatesModel() { Id = 8, Name = "Pennsylvania", CityModels = PhiladelphiaCity });

            var MichiganCity = new List<CityModel>();
            MichiganCity.Add(new CityModel() { Id = 9, Name = "Detroit" });
            MichiganCity.Add(new CityModel() { Id = 10, Name = "Lansing" });
            MichiganCity.Add(new CityModel() { Id = 11, Name = "Grand Rapids" });
            States.Add(new StatesModel() { Id = 12, Name = "Michigan", CityModels = MichiganCity });

///Insert Data in database

            PreserveIds(States)

///Update data in database 


            foreach (var State in States)
            {
                Console.WriteLine(string.Format("{0}", State.Name));
                Console.WriteLine(string.Format("{0} = {1}", State.Id ,State.OriginaId));
                foreach (var city in State.CityModels)
                {
                    Console.WriteLine(string.Format("{0}", city.Name));
                    Console.WriteLine(string.Format("{0} = {1}", city.Id, city.OriginaId));
                }
            }


        }


        public static void PreserveIds(IEnumerable<StatesModel> States)
        {
            if (States != null)
            {
                foreach (var State in States)
                {
                    if (State.OriginaId == 0)
                    {
                        State.OriginaId = State.Id;
                    }

                    foreach (var city in State.CityModels)
                    {
                        if (city.OriginaId == 0)
                        {
                            city.OriginaId = city.Id;
                        }
                    }
                }
            }
        }
    }

Model

    public class StatesModel
    {
        public int Id { get; set; }
        public int OriginaId { get; set; }
        public string Name { get; set; }
        public List<CityModel> CityModels { get; set; }
        public StatesModel()
        {
            CityModels = new List<CityModel>();
        }
    }


    public class CityModel
    {
        public int Id { get; set; }
        public int OriginaId { get; set; }
        public string Name { get; set; }
    }