Here is another bundle that will help create a more robust user experience UX for your web apps. It allows you to in invoke server-side validation through the use of AJAX. It simplifies the coding of such validations while providing guidelines on how to perform security validation in order to protect your sites from SQL Injection, Cross-Site scripting, etc. If you are interest, take a look here: http://www.codeplex.com/websf/Wiki/View.aspx?title=Validation_landing_page