async void OnZmienEmail(object sender, EventArgs e)
        {
            string emailnew = Newemail.Text;

            if (emailnew.IndexOf("@") > 0)
            {
                Dbemail em = new Dbemail();
                Email   t  = new Email();
                t.Nazwa    = emailnew;
                t.Password = newpass.Text;
                t.ID       = 1;
                try
                {
                    em.Zapiszemail(t);
                }
                catch (Exception ex) { }
                await DisplayAlert("Hurra", "Adres e-mail zostal zmieniony", "ok");

                await Navigation.PushModalAsync(new MainPage());
            }
            else
            {
                await DisplayAlert("błędny adres e-mail", "Podaj poprawny adres e-mail", "ok");
            }
        }
        public ustawienia()
        {
            Email   t  = new Email();
            Dbemail em = new Dbemail();

            t = em.GetEmail();
            BindingContext = t;
            InitializeComponent();
        }