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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.For example, you don't want to process a form that's missing critical information.However, the test will be performed in server code.

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Even if users correctly enter an integer, for example, you might need to make sure that the value falls within a certain range.

Note Important Validating user input is also important for security.

These pairs let you define rules for both conditions: an error condition and a "normal" (non-error) condition.

It's important to understand that the markup for the error display is always rendered, even if there are no errors.

For example, if a page has an element as a placeholder for an individual field error, even if there is no error.

In some situations, displaying an error message can cause the page to reflow and can cause elements on the page to move around.

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

Users get immediate feedback, which is convenient for them.

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.

To see how validation works, run this page and deliberately make mistakes.

A mechanism to notify and validate pending exports in FIM and AAD Sync. There is no native method to do this in the FIM Sync / AAD Sync software.