I am developing a web application in .Net 4.0, where I need to use Imagebutton within UpdatePanel.
Everything is working fine i.e. I am able to do asynchronouse postback in all browsers except Latest version of IE IE11.
I registered Imagebutton Asyncpostbackevent in scriptmanager but still not able to do asyn. postback.
Everytime I am getting error as in screen-shot attached.