private async void PhoneSubmitAction()
        {
            if (string.IsNullOrWhiteSpace(RollNo))
            {
                _dialog.ShowToastMessage("Invalid Roll Number");
            }
            else if (string.IsNullOrWhiteSpace(PhoneNo))
            {
                _dialog.ShowToastMessage("Invalid Mobile Number");
            }
            var response = await _memberHandler.VerifyPhoneNo(RollNo, PhoneNo);

            if (response != null && response.Actionstatus)
            {
                RegistrationState = RegistrationState.Mobile;
                try
                {
                    _platformService.VerifyPhoneNumber(PhoneNo,
                                                       VerifyOtpCommand, VerifyFailedCommand, CodeSentCommand, VerifyAuthCommand);
                }
                catch (Exception ex)
                {
                    LogEngine.Error(ex);
                }
            }
            else
            {
                _dialog.ShowMessage("Error", response?.Message);
            }
        }