CreateUserWizard - Referencing MembershipProvider object

Hi,
I am trying to customize the CreateUserWizard control. Basically my objective is to save additional parameters when creating a new user. The issue I have is that I want the SQLMembershipProvider's CreateUser function and my customized function that saves additional data to the DB to be wrappred in a transaction.
So far I decided to override the SQLMembershipProvider class and add in private variables to store my additional data (ie DOB). Then I override the CreateUser method as follow:
 
1 public override MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out Mem ...