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I have grid view that is inside the update panel i thave to cascade drop down that filters the grid content.
i am getting this error when i am closing my page Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.
 
When i remove update panel then it works fine
 
Thanks in advance
 
Please replay fast
Posted 7-Nov-11 2:07am
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Solution 3

set ScriptMode="Release" for script manager
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Comments
Venkateshan.P at 16-Aug-12 7:24am
   
This is great , and working fine
Bhargava Katta at 13-Mar-13 1:44am
   
i too got resolved that issue, bt its effecting other events.
 
i have update panel and a ajax modelpopup. i m getting Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method. i got resolved this by ScriptMode="Release". but my modal popup close button event which i am handling in code behind is not firing, and its giving javascript error as click event not found.
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Solution 2

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