A monthly overview of things you need to know as an architect or aspiring architect. Unlock the full InfoQ experience by logging in! Stay updated with your favorite authors and topics, engage with ...

Here's how to integrate the ASP.NET CustomValidator control with client-side code to create a page that uses Ajax and server-side code to validate data at the browser.

The function orders the validation tests roughly according to increasing cost. In particular, the more complex regular expression and, certainly, the DNS lookup, both come last.