Wheeler is an expert in computer security and has long worked in improving development techniques for large and high-risk software systems.
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You can use the Validation controls to perform very different types of form validation tasks.
For example, you can use the Validation controls to check whether a form field has a value, check whether the data in a form field falls in a certain range, or check whether a form field contains a valid e-mail address or phone number. Even if you need to perform a very specialized form validation task, you can do so by using this control.
Traditionally, Web developers have faced a tough choice when adding form validation logic to their pages.
You can add form validation routines to your server-side code, or you can add the validation routines to your client-side code.
The advantage of writing validation logic in client-side code is that you can provide instant feedback to your users.
For example, if a user neglects to enter a value in a required form field, you can instantly display an error message without requiring a roundtrip back to the server. It looks great and creates a better overall user experience.
The problem, however, is that it does not work with all browsers.