Membership, Username and deletion problem

Hi all,

I'm using the Membership stuff and I'm having a problem. When a user deletes an account their username becomes immediately available so someone else could come along and immediately create an account with the same username. I don't want them to be able to do this. I would prefer it if the username became unavailable for a period of time, such as 90 days. Is there any setting in ASP.NET that can do this for me or do I have to get my hands dirty and write all the code myself?

Please let me know.

Thanks
...