UpdateMode of update Panel

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ASP.NET

Can any one give clear idea about the UpdateMode=conditional of update panel with an example?

Posted 9-Nov-11 1:34am

moneymakermaster

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shashikanth 2011 · Accepted Answer · 2011-11-09T01:41:00

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>UpdatePanel</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">
        <triggers>
            <asp:AsyncPostBackTrigger controlid="UpdateButton2" eventname="Click" />
        </triggers>
            <contenttemplate>
                <asp:Label runat="server" id="DateTimeLabel1" />
                <asp:Button runat="server" id="UpdateButton1" onclick="UpdateButton_Click" text="Update" />               
            </contenttemplate>
        
        <asp:UpdatePanel runat="server" id="UpdatePanel1" updatemode="Conditional">           
            <contenttemplate>
                <asp:Label runat="server" id="DateTimeLabel2" />
                <asp:Button runat="server" id="UpdateButton2" onclick="UpdateButton_Click" text="Update" />
            </contenttemplate>
        
    </form>
</body>
</html>

Here is the CodeBehind. Just add the following method to the file:

C#

protected void UpdateButton_Click(object sender, EventArgs e)
{
    DateTimeLabel1.Text = DateTime.Now.ToString();
    DateTimeLabel2.Text = DateTime.Now.ToString();
}

Quote:
You will notice that then first button updates only the first datestamp, while the second button updates both. Why? We have set the Panels to update conditionally, which means that their content is only updated if something insides them causes a postback, or if one of the defined triggers are fired. As you can see, the first UpdatePanel carries a trigger which references the second button. This will ensure that the first panel is updated even when a control on a different UpdatePanel is used. The AsyncPostBackTrigger tag is pretty simple - it only takes two attributes, the controlid, a reference to the control which can trigger it, and the eventname, which tells which eventtype can cause the trigger to fire. If you wish for the content of a UpdatePanel to be updated no matter what, you may change the updatemode property to Always.