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ASP.NET - AJAX functionality not working on the page | Getting ‘Sys’ is undefined 
MSDN Blogs | by rakkim | Fri, Feb 27
MSDN Blogs is the #1 Blogger for Ajax
When the ASP.NET AJAX Functionality is not working on a web page, it is usually due to the fact that the javascript needed for AJAX is not sent to the client from the server for some reason. ‘Sys’ is undefined. You might see this error message when there is a problem with the client in receiving th...
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