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Q: 

sys is undefined error in asp.net ajax ie. 7

I am using autocomplete extender list to show dropdown on text box. The function works perfectly in firefox but in IE I get intermittent JAVASCRIPT error "sys is undefined' and list stops popping.

I have all necessary settings in web.config best of my knowledge.

  • Error is visible only in IE
  • when checked in fiddler saw 500 error ( scriptresource.axd not found )

The error is only in IE and once the browser temp internet files are cleared the error goes away. But appears back after some time.

How to fix this problem without asking user to clear browser cache multiple times in a day .

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