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By default, WebUIValidation.js is installed in a directory named aspnet_client located beneath your Web server's wwwroot directory If you change the location of your root directory, you need to copy the aspnet_client directory to the new directory;. Otherwise, the validation script will not work. If WebUIValidation.js can not be found, you receive the error Warning! Unable to find script library 'WebUIValidation.js'Microsoft includes a command-line tool with the ASP.NET Framework named aspnet_regiis that you can use to automatically install and uninstall the script library. to install the script library execute aspnet_regiis -c, to uninstall the library execute aspnet_regiis -e. The aspnet_regiis tool is located in your /WINNT/Microsoft.NET/Framework/[version]/directory. beginners often It is easy to solve the mistake. Excerpted from "ASP.NET Unleashed"
