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Client side validation is considered convenient for users as they get instant feedback. Suppose, you wish to perform validation on page when user clicks submit button. To make this happen, simply set the Cause Validation property to true for submit button as shown below: Lets understand validation controls one by one with practical demonstration: Required Field Validation Control The Required Field Validator control is simple validation control, which checks to see if the data is entered for the input control.The main advantage is that it prevents a page from being postback to the server until the client validation is executed successfully. Server validation will only performed when Cause Validation is set to true. You can have a Required Field Validator control for each form element on which you wish to enforce Mandatory Field rule.At any cost server validation will work always whether client validation is executed or not. The attributes that are necessary to this control are: Maximum Value, Minimum Value, and Type.

Validation is important part of any web application.

Whether it's a search form, a login screen or a multi-page registration wizard, Tapestry uses standard HTML forms, with HTTP POST actions by default.

In addition, AJAX-based form submission is supported using Zones.

User's input must always be validated before sending across different layers of the application.

Validation controls are used to: Client side validation is good but we have to be dependent on browser and scripting language support. NET Web pages for user input is to be able to check that the information users enter is valid. NET provides a set of validation controls that provide an easy-to-use but powerful way to check for errors and, if necessary, display messages to the user. NETUsually, Validation is invoked in response to user actions like clicking submit button or entering data.

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