ASP.NET

<asp:button id="button1" runat="server" text="button1" />
<asp:upddatepanel id="upddatepanel1" runat="server">
<triggers>
<asp:asyncpostbacktrigger ControlID="button1" EventName="Click" />
</triggers>
</asp:upddatepanel>
<asp:UpdateProgress ID="ModalUpdateProgress1" DisplayAfter="0"
        runat="server" AssociatedUpdatePanelID="upddatepanel1">
 <ProgressTemplate>
     Loading ...
 </ProgressTemplate>
</asp:UpdateProgress>

function btn_save_Click() {
		//__doPostBack('btn_ticketsave', null);
		//		alert("yup");
		try {
			$.ajax({
				type: 'POST',
				url: '~/TravelTicket.ascx/testMethod',
				data: '{}',
				contentType: 'application/json; charset=utf-8',
				dataType: 'json',
				success: function (result) {
					alert(result);
				}
			});
		}
		catch (ex) {alert(ex);}

	}