Element AsyncPostBackTrigger is not a known element. This can occur if there is a compilation error in the Web site or the web.config file is missing

Question

back again and hi what does that means below warningElement AsyncPostBackTrigger is not a known element This can occur if there is a compilation error in the Web site or the webconfig file is missing my app is working properly but visual studio showing warning like that

Mudassar · Accepted Answer

Your Visual Studio 2008 might give warnings hen AJAX Extensions are not installed properlyIf your application is working fine you can ignore this warning

Element AsyncPostBackTrigger is not a known element. This can occur if there is a compilation error in the Web site or the web.config file is missing

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