membership.CreateUser issue

I am trying to create a method to save a user's info and return the user's ID...  For some reason _membershipUser comes back null every time... can someone tell me if they see something I am doing wrong ?
 
public void saveNewUser()
        {
        try
            {
               MembershipUser  _membershipUser = Membership.CreateUser(UsrName, txtPassword.Text, txtEmail.Text, ddlQuestion.SelectedItem.Text, txtAnswer.Text, true, out _memberStatus);
              
                // get UserID   
         &nbs ...