public static void DeleteContactInstance(ContactInstance instance)
        {
            ContactDal dbContactDal = db.Contacts.Find(instance.UniqueId);

            if (dbContactDal == null)
            {
                Console.WriteLine("Couldn't find entity to delete!");
            }
            else
            {
                db.Contacts.Remove(entity: dbContactDal);
                db.SaveChanges();
            }
        }
        public static void UpdateContactInstance(ContactInstance instance)
        {
            ContactDal dbContactDal = db.Contacts.Find(instance.UniqueId);

            if (dbContactDal == null)
            {
                Console.WriteLine("Couldn't find entity to update!");
            }
            else
            {
                dbContactDal.FirstName = instance.FirstName;
                dbContactDal.LastName  = instance.LastName;
                db.Contacts.AddOrUpdate(dbContactDal);
                db.SaveChanges();
            }
        }