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The opposite pros and cons that applied to processing data validation on the user's computer apply to processing data validation on the Web server.For instance, since the validation occurs on the Web server, your application must post the Web page that the user is viewing back to the Web server for validation to occur.NET to allocate any space on the page ahead of time to display a validation control message. NET will dynamically allocate space on the page on the fly.If you choose the Dynamic value and your validation fails, you could cause visual layout problems on pages that use HTML tables for page layout.Furthermore, the data validation scripts are protected inside the Web server so they are not vulnerable to malicious user modifications.In its efforts to improve Web development on the whole, Microsoft included in ASP. NET validation controls), which offer an exceptional solution to data validation. NET comes with five validation controls as well as a summary control. NET Web application renders the data validation controls on the user's computer as HTML elements based upon the selected Target Schema property.The Run At="Server" attribute is required for all ASP. The Display attribute determines how space is reserved to display the validation control message if data validation fails. NET will allocate the space on the page when the page is rendered. Other possible values for the Display attribute are Dynamic and None. NET validation controls uses a script library called Web and implements Microsoft JScript functionality that is only supported by Microsoft Internet Explorer 4.0 and later versions.A Display attribute value of Dynamic specifies that you don't want ASP.

He is a Microsoft Certified Application Developer (MCAD), Microsoft Certified Solution Developer (MCSD) and a Microsoft Certified Trainer (MCT) who has been developing Microsoft Windows and Web-based solutions as well as training for over 12 years. Shannon lives in Glendale, AZ, and is married with two daughters and a son. Validating the information entered by users is an essential part of developing a professional Web-based user interface.

All of the data validation controls are displayed in the toolbox when ASP.

NET displays a Web form or Web user control in design view in Visual Studio . You can also (directly in HTML or programmatically) add data validation controls to Web forms and Web user controls. NET data validation control is the Required Field Validator control.

Some resources also refer to Jscript (Microsoft) and ECMAScript (European Computer Manufacturer's Association), but these are both derivatives of Java Script.

Since only Microsoft Internet Explorer supports VBScript, you'll probably choose Java Script as your primary scripting language to use on a user's computer.

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In addition, malicious users can subvert the validation process.

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