public RegisterModel(
     UserManager <IdentityUser> userManager,
     SignInManager <IdentityUser> signInManager,
     ILogger <RegisterModel> logger,
     IEmailSenderP emailSender)
 {
     _userManager   = userManager;
     _signInManager = signInManager;
     _logger        = logger;
     _emailSender   = emailSender;
 }
 public ForgotPasswordModel(UserManager <IdentityUser> userManager, IEmailSenderP emailSender)
 {
     _userManager = userManager;
     _emailSender = emailSender;
 }