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Request validation helps to prevent this kind of attack by throwing a "potentially dangerous value was detected" error and halting page processing if it detects input that may be malicious, such as markup or code in the request.Request validation is generally desirable and should be left enabled for defense in depth.

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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.

He has been a featured speaker at many industry events including Microsoft Dev Days and the ASP. Shannon speaks and trains for companies such as App Dev ( and Learn It ( and has been a featured speaker in training videos with Learn Key. Data validation over the Web is performed in one of two locations: on the user's computer, or on the Web server.

This MSDN article has an example of using both server side and client side validation: Custom Validator Example I used your markup and code-behind and it seems to work.

Shannon Horn is the co-founder and chief software architect of Web Geniuses Corporation ( Hence, many times validation was not performed in a uniform manner, complex validation was difficult to implement, and Web servers were vulnerable to validation scripts being modified by malicious users.

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When a project builds, the first thing it does is 'validate web pages'.NET 4.5 that include deferred ("lazy") validation, the ability to opt-out at the server control level, and the ability to access unvalidated data.In order to leverage these enhancements you will need to ensure that request Validation Mode has been set to "4.5" in web.config: ASP.This check adds protection from markup or code in the URL query string, cookies, or posted form values that might have been added for malicious purposes.This exploit is typically referred to as a cross-site scripting (XSS) attack.For example if user input is returned to the browser as the result from an AJAX request to a Web API method.

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