I have been scouring the internet (and this forum) all day and cannot find what I am looking for. I have a new user registration page that works, but without verification. I am using Dreamweaver 8 with ASP and Java. My form includes the fields: UserName, Password, EmailAddress, FirstName.... etc. When I fill out the form with <b><i>new</i></b> information, the registration is successful. If I fill out the form and use a UserName that is already taken, I get and ASP error 500.100.

How can I validate usernames and email addresses as not being already in use? If a username is already taken, or an email address is already being used, I would like the page to say it is already taken.

What is the best mothod to go about this routine?