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validation server control
comp., MS	controllo server di convalida (A server control, included with ASP.NET, that verifies user input. The input is checked as it comes from HTML server controls and Web server controls (for example, a Web page form) against programmer-defined requirements. Validation controls perform input checking in server code. If the user is working with a browser that supports DHTML, the validation controls can also perform validation using client script)