<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
                <ContentTemplate>
                    <%= DateTime.Now.ToString() %>
                    <asp:Button ID="Button1" runat="server" Text="Update" />
                </ContentTemplate>
                <Triggers>
                    <asp:PostBackTrigger ControlID="Button2" />
                </Triggers>
            </asp:UpdatePanel>
