ASP.NET 4 Unleashed

Using the CustomValidator Control

If none of the other validation controls perform the type of validation that you need, you can always use the CustomValidator control. You can associate a custom validation function with the CustomValidator control.

The CustomValidator control has three important properties:

• ControlToValidate— The ID of the form field being validated.

• Text— The error message displayed when validation fails.

• ClientValidationFunction— The name of a client-side function used to perform client-side validation.

The CustomValidator also supports one event:

• ServerValidate— This event is raised when the CustomValidator performs validation.

You associate your custom validation function with the CustomValidator control by handling ...