private async void Button_Clicked(object sender, EventArgs e)
        {
            bool loggedin = true;// Here Put The Boolean Method that Checks If He's Logged In

            if (loggedin)
            {
                bool yesno = await DisplayAlert("Sending Request", "Are You Sure You Want To Request This Book ?", "Yes", "No");// Depending On His Answer

                if (yesno)
                {
                    var Req = new Request()
                    {
                        UserEmail = "EMAIL",
                        BookISBN  = bk.ISBN,
                        BookTitle = bk.Title,
                        dateTime  = DateTime.Now,
                    };
                    await FirebaseHelper.AddRequest(Req);
                    await DisplayAlert("Success", "Your Request Has Been Sent", "Ok");
                }
            }
            else
            {
                await PopupNavigation.Instance.PushAsync(new Login());
            }
        }