Chapter 16. Adding Form Field Validation Using ASP.NET
IN THIS CHAPTER
The Necessity of Form Validation
Common Validation Control Properties
Adding and Configuring ASP.NET Validation Controls
The Necessity of Form Validation
If you’re going to offer a form for user input on your website, you should always validate the input that the user provides. There are a couple of reasons why form validation is important. First of all, it ensures that the user provides you with the kind of information you expect. If you are expecting a phone number and a user enters text, you end up with bad data.
Secondly, it ensures that a malicious user doesn’t cause problems by entering bad data. For example, suppose you have a ...
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