How to check for duplicate usernames?

[Admin]

And how do I do that? 

Mike 

On Thu, 4 Aug 2011 09:53:44 -0600,
Jeff Massung wrote: 

> Instead of checking for a username, mark the
UserName field in the table as
> being UNIQUE. This will cause the DB to
error out of a transaction that
> attempts to insert the same UserName
into the table multiple times. Then
> catch that.
> 
> Jeff M.
>
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