asp:CreateUserWizard - stop users from registering accounts with duplicate email addresses

We have an issue with our system where many users have different accounts and get confused
we'd like to stop users from trying to register a new account if the email address has previously be registered

is there anyway to do this on the <asp:CreateUserWizard control?

thanks
websssAsked:
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Mayavan RTechnical ConsultantCommented:
Try this in your web.config file just change connectionstring name with your's

Web.Config should be in the root of your application

set requiresUniqueEmail="true"

For example refer below forum link

Link : http://forums.asp.net/p/1117970/1738068.aspx#1738068
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