AJAX fun with the dreaded 'sys is undefined' error
If you have started to play with AJAX then you have most likely come across the dreaded 'sys is undefined' error. I found numerous articles on how to get this working but the best ones all point to making sure you have the correct entries in your web.config. So to summarize what I have read:
1) Go to C:Program FilesMicrosoft ASP.NETASP.NET 2.0 AJAX Extensions{your version of AJAX}
2) Open the sample web.config file and make sure you have the same entries in your web.config
3) If you don't then copy and paste is your friend :)
4) See if the app works now
Here are a couple of articles to assist if you are still having issues:
Chris Riccio's blog https://weblogs.asp.net/chrisri/archive/2007/02/02/demystifying-sys-is-undefined.aspx
Lorin Thwaits's blog https://geekswithblogs.net/lorint/archive/2007/03/28/110161.aspx