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Note Even if you use client-side validation, validation is always also performed in server code.

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Note Important Validating user input is also important for security.

When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.

For example, suppose you specify that a value should be an integer.

If a user enters a non-integer value, the error is reported as soon as the user leaves the entry field.

Unbound is a validating, recursive, and caching DNS resolver.

The C implementation of Unbound is developed and maintained by NLnet Labs.

Unbound is subject to NLnet Labs Security Patch Policy Commercial support for Unbound is available from several organizations.

This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.

In this example, the test for a valid date won't work in client code.

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