Control in UpdatePanel is not getting Updated

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I use an UpdatePanel with some controls. When I click on the button, it creates a sleep. In this time I click on second button, its handlers execute async successfully. But one of the labels does not get updated. Why?

ASP.NET

<body>
    <form id="form1"  runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        
        <asp:UpdatePanel ChildrenAsTriggers="true" ID="UpdatePanel1"  runat="server" >
            <contenttemplate>
                    <asp:Button runat="server" Text="PostBackFirst" ID="btnPostF" 
                        onclick="btnPostF_Click"/> 
                    <asp:Button runat="server" Text="PostBackSecond" ID="btnPostS"
                        onclick="btnPostS_Click"/> 
                    <asp:Button runat="server" Text="AbortPostBack" ID="btnAbort"
                        OnClientClick="Sys.WebForms.PageRequestManager.getInstance().abortPostBack();
                        alert('Postback Cancelled');"/>
                    <asp:Label ID="Label1" runat="server" Text="">            
                    <asp:Label ID="Label2" runat="server" Text="">            
            </contenttemplate>
            
    </form>
</body>

C#

protected void btnPostF_Click(object sender, EventArgs e)
       {
           System.Threading.Thread.Sleep(4000);
           Label1.Text = "PostBack 1 Completed";

       }

       protected void btnPostS_Click(object sender, EventArgs e)
       {
           System.Threading.Thread.Sleep(4000);
           Label2.Text = "PostBack 2 Completed";

       }

Posted 22-Aug-11 5:32am

User 7427435

Updated 25-Aug-11 23:19pm

Tech Code Freak

v3

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Comments

Herman<T>.Instance 22-Aug-11 13:46pm

which one does not update?

[no name] 22-Aug-11 14:56pm

i have two lable in update panel ,when btnPostF button click and then btnPostS button,
only lable2 to update in update panel and lable2 do not update!!

Herman<T>.Instance 23-Aug-11 3:34am

does your async really work? Something tells me that the 4 second sleep is standing in the way. try clicking both buttons with a pause of 5 seconds between clicking

2 solutions

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hitech_s · Answer 1 · 2011-09-15T23:33:00

Solution 1

i think autopostback=true for the two labels will work fine..

Posted 15-Sep-11 23:33pm

hitech_s

Updated 15-Sep-11 23:34pm

v2

Anup Das Gupta (asteranup) · Answer 2 · 2011-09-16T00:26:00

Hi,

Things are behaving correctly. Let me explain how it is working-

Suppose you click on the first button, on click it comes to the click event and it sleeps for 4 seconds. Now while its in sleep if you abort the post back by clicking third button. Then it will not proceed with the event. If you wait for 4 second then you can see the label is updated with the desired value. Same with second button.