public async Task <IActionResult> SendCode(SendCodeModel model)
        {
            if (!ModelState.IsValid)
            {
                return(View());
            }

            var user = await _signInManager.GetTwoFactorAuthenticationUserAsync();

            if (user == null)
            {
                return(View("Error"));
            }

            // Generate the token and send it
            var code = await _userManager.GenerateTwoFactorTokenAsync(user, model.SelectedProvider);

            if (string.IsNullOrWhiteSpace(code))
            {
                return(View("Error"));
            }

            var message = "Your security code is: " + code;

            if (model.SelectedProvider == "Email")
            {
                await _emailSender.SendEmailAsync(await _userManager.GetEmailAsync(user), "Security Code", message);
            }

            /*else if (model.SelectedProvider == "Phone")
             * {
             *  await _smsSender.SendSmsAsync(await _userManager.GetPhoneNumberAsync(user), message);
             * }*/

            return(RedirectToAction(nameof(VerifyCode), new { Provider = model.SelectedProvider, model.ReturnUrl, model.RememberMe }));
        }