I would like as part of the createaccount.aspx, check another external membership database to make sure that the username is not already taken up.
What event of method can I override to do that short or rewriting it completely?
I am quite familiar with the account and user API, but I don't want to code all the validators that already exist in the createaccount.aspx.
The other thing I wanted to check as part of validation was UNIQUENESS of the email. The unique flag in the configuration for the user does not work.