public void AddOwner(DogOwner aDogOwner)
        {
            using (DogsDirectoryContext dbContext = new DogsDirectoryContext())
            {
                dbContext.Owners.Add(aDogOwner);

                dbContext.SaveChanges();
            }
        }
        public void AddDog(DogOwner aDogOwner, Dog aDog)
        {
            using (DogsDirectoryContext dbContext = new DogsDirectoryContext())
            {
                aDog.Owner = dbContext.Owners.First(owner => owner.Id == aDogOwner.Id);

                dbContext.Dogs.Add(aDog);

                dbContext.SaveChanges();
            }
        }