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In the above example we have tied two validation controls to the Hire Date Text Box.The Range Validator does not validate the contents of an input control if the control is empty.Simply put, never trust the data in an incoming request, and always validate on the server.When validation fails the normal flow of execution continues.The cancel button has a Causes Validation property. As we mentioned in the beginning of the article, validation can occur twice: once on the client’s machine and once on the server. Client side validation provides quick feedback for the user.Validation occurs when a user clicks any Button control by default, but you can change this behavior by setting the Causes Validation property to false. Whenever the user presses a button on the form, the script executes the validation checks for each validation control on the form.
Validation is complete by the time you reach a click event.The one exclusion to this rule is the Custom Validator component.