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And I can't put a required control on it, because it isn't always required. A: Validator controls come in many different flavors. The problem is if there is no value in the ZIP code box, a custom validation control still considers it valid.You can also use the Rad Input controls to trigger the validation of other controls on the page.To make a Rad Input control trigger other validators when it causes a postback: By default, all validators on the Web page must be successful before the postback that the input control initiates can occur.You can prevent validation when a button control is clicked by setting the Causes Validation property to false.The syntax for creating a Validation server control is: In the following example we declare one Text Box control, one Button control, and one Range Validator control in an file.The code above illustrates a limitation in Classic ASP: The code block has to be placed where you want the output to appear.With Classic ASP it is impossible to separate executable code from the HTML itself.
Since Q2 2012 there are some modifications for Rad Input validation.Each validation control performs a specific type of validation (like validating against a specific value or a range of values).By default, page validation is performed when a Button, Image Button, or Link Button control is clicked.The id attribute is added to identify the server control.The id reference can be used to manipulate the server control at run time.