jQuery event conflicts with ASP.NET Update Panel

There is a problem when I attached click event to ASP page inside Update Panel control.
I put click event onto a button using jQuery.

$("#btn").click(function () {
	alert("clicking button");

After asynchronous load is triggered by update panel, clicking that button will not show any alert anymore.
Seems click event are detached.
The fact is any event control which put using client side or jQuery will failed inside update panel. Why?

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