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Editorial Team
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Asked: 2026-05-23T08:31:22+00:00

I’m trying to have two things happen when I click on a button in

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I’m trying to have two things happen when I click on a button in an ASP.NET page:

  1. Change the text in an ASP:Label.
  2. Disable the button.

I’ve done a lot of research on this, but I’ve had difficulties doing either.

For #1, I thought that this should work, but it doesn’t:

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">


    Protected Sub BtnSubmit_Click(sender As Object, e As System.EventArgs)
        Label1.Text = "Working..."

        System.Threading.Thread.Sleep(5000)

        Label1.Text = "Done."

    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Test Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <ajaxToolkit:ToolkitScriptManager runat="server" />
    <div>
        <asp:ListBox runat="server" Height="100px" />
        <br />
        <asp:UpdatePanel runat="server">
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="BtnSubmit" EventName="Click" />
            </Triggers>
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Press the button" />
            </ContentTemplate>
        </asp:UpdatePanel>
        <br />
        <asp:Button runat="server" ID="BtnSubmit" OnClick="BtnSubmit_Click" Text="Submit Me!" />
    </div>
    </form>
</body>
</html>

The “Working…” message is never displayed.

As for #2, I added this to the button (I forget where I found it):

OnClientClick="this.disabled = true; this.value = 'Working...';"
            UseSubmitBehavior="false"

That had the desired effect of disabling the button and changing its text (value), but it wasn’t possible to change it back using Text and Enabled properties.

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1 Answer

  1. Editorial Team

    ASP will not flush the result to the browser while working even if you use an UpdatePanel. It will finish the jobb (including the sleep) before flushing.

    You can use a UpdateProgress to show the “Working..” text.

    <asp:UpdateProgress>

    This will show its content while the UpdatePanel is working. Once the UpdatePanel is finished, the content will disappear.

    What you need in you ClickEvent is:

    Label1.Text = "Done."
btnSubmit.Enabled = false

    This will show the Done text and disable the button. And tell the UpdateProgress to disappear.

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