DapperDinner Part 3 Object State

IDinnerRepository.cs

public interface IDinnerRepository
{
    Dinner NewDinner();
    RSVP NewRsvp(int dinnerId);

    PagedList<Dinner> FindByLocation(float latitude, float longitude, string orderBy = "DinnerID", int page = 1, int pageSize = 20);
    PagedList<Dinner> FindUpcomingDinners(string orderBy = "DinnerID", int page = 1, int pageSize = 20);
    PagedList<Dinner> FindUpcomingDinners(DateTime? eventDate, string orderBy = "DinnerID", int page = 1, int pageSize = 20);
    PagedList<Dinner> FindDinnersByText(string q, string orderBy = "DinnerID", int page = 1, int pageSize = 20);
    IEnumerable<Dinner> AllDinnersByUser(string name);

    Dinner Find(int id);

    void InsertOrUpdate(Dinner dinner);
    void InsertOrUpdate(RSVP rsvp);

    void Delete(int id);
    void DeleteRsvp(RSVP rsvp);
}

ITracker.cs

public interface ITracker
{
    ObjectState State { get; set; }
}