How to check if username exists outside of "CreateUserWizard? (Custom User Creation Process)

Hi Folks,

I am building a custom user creation interface, using the Wizard Control.

The reason I am using the ââ?¬Å?Wizard Controlââ?¬Â and not the ââ?¬Å?CreateUserWizardControlââ?¬Â is because I need to process a transaction before the user is created.
However, when the transaction is approved I want it to create the user account in the same step, and not prompt the user again for info (in case there is a disconnection and the final step is not completed)

So I am doing my own Wizard steps to collect the info before the transaction, and when the transaction is approved in the same breath it creates the user account.

But before going to the final step, I need to make sure that the username chosen is unique? I know that the ââ?¬Å?CreateUserWizardControlââ?¬Â automatically checks to see if the username is uniqueââ?¬Â¦I need to do the same thing, but I am not using the ââ?¬Å?CreateUserWizardââ?¬Â ââ?¬â??  So how can I check if the username chosen is unique?
What functions does the ââ?¬Å?Cre ...