First, you need to send them an email. Use the System.Web.Mail namespace for this. Take a look at the
MSDN article on the System.Web.Mail.SmtpMail class.
Within the body of the email you need to provide a link that is unique for that user. Usually, you would provide something that identifies the user on the querystring of the link and also provides some key so that the verification can't be spoofed. You could use a GUID as the key. Save the GUID to the user data, then generate and send the email with the link.
http://www.myserver.com/myWebApp/ver...E-AB265210F43E
Then the verifyUser page reads the userid and guid off the querystring and checks that against the database and changes the user status to "valid".
Peter
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Work smarter, not harder