The RegisterAsyncTask in Page_load calls the acx control using ContinueWith
The acx control contains CollapsiblePanelExtender.
This give the error:
Extender control 'cpe1' is not a registered extender control. Extender controls must be registered using RegisterExtenderControl() before calling RegisterScriptDescriptors().
Parameter name: extenderControl .
1. There is no error if I call the acx control without Continuation but this is ruled out.
2. There is no error if I remove the collapsePanelExtender from acx control and use it in continuation with async task .
Please let me know if any further information is required?
Comments: The Sample application seems to work fine when created using fresh project in VS2012 So, it might be some settings in the old legacy application which is causing the issue. This issue can be closed now
The acx control contains CollapsiblePanelExtender.
This give the error:
Extender control 'cpe1' is not a registered extender control. Extender controls must be registered using RegisterExtenderControl() before calling RegisterScriptDescriptors().
Parameter name: extenderControl .
1. There is no error if I call the acx control without Continuation but this is ruled out.
2. There is no error if I remove the collapsePanelExtender from acx control and use it in continuation with async task .
Please let me know if any further information is required?
Comments: The Sample application seems to work fine when created using fresh project in VS2012 So, it might be some settings in the old legacy application which is causing the issue. This issue can be closed now