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I developed an ASP.NET application for my company that is configured on several laptops. Yesterday I was given the task to fix an error that was causing the ASP.NET Ajax features to flake and not work. I spent hours on Google searching for an answer. If you did before reading this article, I wont be asking you to edit your web.config file or setting the CombineScripts property for the ToolkitScriptManager to false. I tried all of those and alas the problem remained. You are free to try those if my solution does not work for you.

I fixed this issue by pure chance. While troubleshooting, I realized that the clock was showing the incorrect date and time. I merely corrected that and realized soon after that everything worked flawlessly. There were no more ‘Sys’ is undefined or ‘AjaxControlToolkit’ is undefined javascript errors. I figured this error occurs since the last modified date on the assemblies associated with ‘Sys’ and ‘AjaxControlToolkit’ would have had a future date and caused a problem. What problem specifically? I am unable to answer even after some research on Google.

I hope that my solution will save you some time. Please let me know in the comments if it helped!

Ever so often, an application must communicate with its user when it is working. The most basic of methods is to display a popup message, usually when a task is complete or some error has occurred. In windows form programming, displaying a popup message box to the user is really easy. Unfortunately, this is not so simple when doing web programming, specifically ASP.NET. There is no native method to initiate a message box in ASP.NET. Read more…