Validating web form controls using dhtml

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For example, client-side validation might not be possible if validation requires information or resources that are available only on the server, such as access to a database.By default, when client-side validation is being performed, the user cannot post the page to the server if there are errors on the page.Instead, it follows the 80/20 rule: The validation engine will be useful in about 80 percent of the use cases you might need to address.

Dragging an Error Provider onto the visual designer (or instantiating it in code) gives you the basic component required to display validation messages.nput validation is something that every program needs, and every programmer dreads.Most developers craft hard-coded program logic to verify that a phone number consists of 7 or 10 digits; that an IP address consists of 4 octets; that a country name matches 1 of 193 choices, etc. NET 2.0 provides some support for streamlining input validation, it barely scratches the surface of automating and simplifying the input validation process.Note that the method in the example takes a Control as its first argument.That allows the single Error Provider to simultaneously handle error messages for a multiplicity of controls.

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