Validation involves the rules to evaluate data entry fields and a user interface that communicates errors clearly to the user. DES handles both with great attention to detail and completeness.

Here some of the advantages of using DES for your validation:

• 27 validator controls. (The native framework only has 5.) There are 14 in Peter's Professional Validation and 13 in Peter's More Validators.
• The ability to combine the rules of several validators under one error message using the MultiConditionValidator.
• Validators can intelligently disable themselves when not needed.
• Multiple formats for error messages including popups (like the ValidationCalloutExtender), images with tooltips and alert boxes.
• Validation is all about getting the user's attention. DES can change that field's colors, put up an alert, set focus to the field with the error, and blink the error message.
• Greatly enhanced ValidationSummary control.

It's easy to switch to Peter's Professional Validation on existing web applications. The installation process quickly converts the native validators for you.