Specifying UpdatePanel Triggers : UpdatePanel « Ajax « ASP.NET Tutorial

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Trigger Update Panel</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:ScriptManager
        id="sm1"
        Runat="server" />

    Page Time: <%= DateTime.Now.ToString("T") %>
    <br />
    <asp:Button
        id="btnUpdate"
        Text="Update"
        Runat="server" />

    <asp:UpdatePanel
        id="up1"
        Runat="server">
        <Triggers>
            <asp:AsyncPostBackTrigger
                ControlID="btnUpdate"
                EventName="Click" />
        </Triggers>
        <ContentTemplate>

        Update Panel Time: <%= DateTime.Now.ToString("T") %>

        </ContentTemplate>
    </asp:UpdatePanel>

    </div>
    </form>
</body>
</html>

20.11.UpdatePanel
	20.11.1.	Using the UpdatePanel Control
	20.11.2.	Entering customer feedback into an Ajax-enabled form.
	20.11.3.	Specifying UpdatePanel Triggers
	20.11.4.	Nesting UpdatePanel Controls
	20.11.5.	Updating UpdatePanels Programmatically
	20.11.6.	UpdatePanels and JavaScript
	20.11.7.	Show Alert UpdatePanel
	20.11.8.	UpdatePanel Server-Side Page Execution Lifecycle
	20.11.9.	UpdatePanel Client-Side Page Execution Lifecycle
	20.11.10.	UpdatePanel Custom Progress