Datepicker,button event does not work inside updatepanel in asp.net

//datepicker error fixing

$(function () {
Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(EndRequestHandler);
function EndRequestHandler(sender, args) {

$("#ContentPlaceHolder1_txtAdmissionDate").datepicker();
}
});

//Button event error fixing

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

<Triggers>
<asp:PostBackTrigger ControlID="btn_upload" />

</Triggers>

</asp:UpdatePanel>