private void VerifyNow_Button_Clicked(object sender, EventArgs e)
        {
            activityIndicator.IsVisible = true;


            if (lblOtpDigit1.Text + lblOtpDigit2.Text + lblOtpDigit3.Text + lblOtpDigit4.Text == responseOtp)
            {
                Task.Delay(1000);
                activityIndicator.IsVisible = false;

                Navigation.PushAsync(new HomePage(), true);
            }
            else
            {
                activityIndicator.IsVisible = false;

                lblOtpDigit1.Text = lblOtpDigit2.Text = lblOtpDigit3.Text = lblOtpDigit4.Text = UpperInvisiblEntry.Text = "";
                Application.Current.MainPage.DisplayAlert(AppConstants.AlertHeading, AppConstants.WongOtpMessage, AppConstants.AletOk);
                UpperInvisiblEntry.Focus();
            }
        }
        async private void Submit_Button_Clicked(object sender, EventArgs e)
        {
            contentViewEnterNumber.IsVisible = false;
            contentViewEnterOtp.IsVisible    = true;
            UpperInvisiblEntry.Focus();

            int temp = 85;

            Device.StartTimer(TimeSpan.FromSeconds(1), () =>
            {
                if (temp <= 0)
                {
                    return(false);
                }

                TimeSpan maxSpan = TimeSpan.FromSeconds(temp--);
                Device.BeginInvokeOnMainThread(() =>
                {
                    spannableStringTimerText.Text = " Re-send in " + maxSpan.ToString();
                });
                return(true);
            });
            //await RequestOTP();
        }