How to check the status of a create user operation

We are developing a web application where users can create an account and right now a user must provide a Question and Answer. Now, we have changed our minds and have decided to remove such a requirement. Actually, our code uses the following overload:
Membership.CreateUser(String userName, String password, String email, String passwordQuestion, String passwordAnswer, bool isApproved, out MembershipCreateStatus status)
And, then the status is checked to determine the result of the operation. If the Question and Answer requirement is removed, the overloaded method we need is the one that includes Username, Password and Email, which means no status argument is present. How can I verify the status of the create user operation in this case?
I include the method which actually creates a user account with Question and Answer.
Respectfully,
Jorge Maldonado 
public void Inserta(ref String strMensaje, ref String strOrige ...