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It can also be an image, or can even be invisible and still do useful work.

There are five types of validator controls that perform different types of checks.

Let's refine our previous definition a little: "A validator is a control that checks one input control for a specific type of error condition and displays a description of that problem." This is an important definition, because it means that you frequently need to use more than one validator control for each input control.

For example, if you want to check whether or not user input in a text box is (a) nonblank, (b) a valid date between a particular range and (c) less than the date in another text input control, you would want to use three validators.

Our objective with validation is as follows: We visited a large number of real pages to determine the sort of scenarios these components needed to be able to handle.

We wanted to dramatically reduce the amount of validation code needed for future applications.

You need to write the server-based checks anyway for clients without script, so it can be hard to justify writing it all over again for rich clients.

In front of each field, we add a Required Field Validator.

The final step is to add a validation summary to the top of the page like so: Here is how it looks on the page: Next we need to enforce the character requirements for the User ID and Password fields.

For these we will use Regular Expression Validator controls.

(11 printed pages) Introduction The Problem The Objective The Solution-Overview Client Features What Is a Validator?

Validator Walk-Through It's Not Voluntary Getting Regular Comparing Apples and Apples Custom Fit The Finale Sample Code Validating user input is a common scenario in a Web-based application.