public void AddPlayer(Player player, string connectionString)
 {
     using (BennetBasketballDb db = new BennetBasketballDb(connectionString))
     {
         db.Players.Add(player);
         db.SaveChanges();
     }
 }
        public int AddGuardian(Guardian guardian, string connectionString)
        {
            int id;
            using (BennetBasketballDb db = new BennetBasketballDb(connectionString))
            {
                db.Guardians.Add(guardian);
                db.SaveChanges();
                id = guardian.Id;

            }
            return id;
        }