Vb net validating controls

This work great when the user enter wrong informations into the control and leaves the control.

However, the validation does not happen if the user click on on without entering any data.

NET removes the hassle of duplicating validation code, a common problem of performing data validation using classic ASP, by neatly encapsulating the standard validations into server controls.

You can declaratively relate the validation control to the control whose value needs to be validated, using the Control To Validate attribute.

A variety of HTML elements, such as text boxes, check boxes, radio buttons, drop-down lists and more, can be used in forms. NET applications are collecting information from a user, you want to ensure that the data that you collect is valid.

Doing so can cause your application or the operating system to stop responding.

This example requires that a Text Box and Error Provider control have been created on a form.This paper focuses on a series of controls that stand out from the rest—.Validation server controls are a series of controls that help you validate the data that the user enters into the other controls that are provided with ASP. They determine whether the form can be processed based upon the rules that you define in the validation server controls.One feature that most web programmers would like to have is a summary of the validation errors for the values entered into a page's controls.The Validation Summary control provides this much-desired feature.

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