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<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers ="false" UpdateMode ="conditional" >
<ContentTemplate >
<%=DateTime .Now %>
<asp:Button ID="Button1" runat="server" Text="Button" />
</ContentTemplate>
<Triggers >
<asp:AsyncPostBackTrigger ControlID ="Button1" EventName ="Click" />
</Triggers>
</asp:UpdatePanel>
<%=DateTime .Now %>
<asp:Button ID="Button2" runat="server" Text="Button" />
</form>
</body>