conditional UpdatePanel doesn’t work

I have the following simple code:


"UpdatePanel2" runat="server" UpdateMode="Conditional">

    "Label3" runat="server" Text="Label">
    "Button2" runat="server" Text="Button" onclick="Button2_Click">

code behind:

    protected void Button2_Click(object sender, EventArgs e)
        Label3.Text = "waiting...";
        Label3.Text = "done";

But it doesn't update the panel until the end. i.e. you don't get to see the "waiting…" text (in fact, you don't see it at all) and then a 5 second pause, then "done". Why doesn't this work? I followed the video and couldn't find a mistake.


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