Chapter 12. Web Form Data Validation
In this chapter
This chapter talks about data validation in ASP.NET. ASP.NET provides a group of validation controls that will make your job as a Web form developer much easier. These controls easily handle the task of data validation in form elements and provide a consistent programming model for developers.
When do you need data validation in an HTML form? Any time you need to ensure the user data is either present or in a specific format. For example, if you are asking users to enter an e-mail address and they type XYZ, that is not a valid e-mail address. They might have purposely entered an invalid e-mail address, ...
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