Programming Microsoft® ASP.NET 3.5

Validation Controls

A key rule for writing more secure applications is to get the data right, before you use it. Getting the data right requires you to apply a validation step to any external input. In ASP.NET, validation controls provide an easy-to-use mechanism to perform a variety of validation tasks, including testing for valid types, values within a given range, or required fields.

Validation controls inherit from the BaseValidator class which, in turn, descends from Label. All validators defined on a page are automatically grouped in the Validators collection of the Page class. You can validate them all in a single shot using the Validate method in the page class or individually by calling the Validate method on each validator. The Validate ...