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Why doesn't this update panel work right?

Posted By:      Posted Date: September 15, 2010    Points: 0   Category :ASP.Net
I don't understand why this update panel doesn't work right.   It doesn't do a partial update.  Enable partial page rendering is set to true but clicking the button causes a full page post back.  The text of the label changes with the full post back. So, the event is firing and being handled but not with a partial post back.    This is with in a content page with in a Master Page.Does anyone see what I've done wrong? <asp:ScriptManager ID="MainScriptManager" runat="server" EnablePartialRendering="true"></asp:ScriptManager> <asp:UpdatePanel ID="pnlHelloWorld" runat="server" UpdateMode="Always"> <Triggers> <asp:AsyncPostBackTrigger ControlID="btnHelloWorld" EventName="Click" /> </Triggers> <ContentTemplate> <asp:Label ID="lblHelloWorld" runat="server" Text="Click the button!"></asp:Label> <br /><br /> <asp:Button runat="server" ID="btnHelloWorld" OnClick="btnHelloWorld_Click" Text="Update label!" /> </ContentTemplate> </asp:UpdatePanel> protected void btnHe

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