private IObservable <string> GetPasswordsSequence()
{
var isUserBased = this.WhenAnyValue(x => x.IsUserLogon);
var userBasedLogon = UserBasedLogin.WhenAnyValue(x => x.Password);
var emailBasedLogon = EmailBasedLogin.WhenAnyValue(x => x.VerifiedPassword);
var usernames = userBasedLogon.CombineLatest(emailBasedLogon, (u, w) => new { Username = u, Email = w });
var sequence = isUserBased.CombineLatest(usernames, (userBased, user) => userBased ? user.Username : user.Email);
return(sequence);
}
