How to stop updatepanel refreshing whole page

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VB

UpdatePanel

Hi -

I have an update panel on my page just to update a specific piece of information when a user makes a selection. Problem is the update panel is refreshing the whole page. I've added the trigger and specifically associated the button. Toggled the update mode between conditional and always and still the whole page is updating.

Any suggestions?

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
       <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
       <asp:Button ID="Button1" runat="server" Text="Button" />
    </ContentTemplate>
    <Triggers>
      <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
                     </Triggers>
</asp:UpdatePanel>

and on page load i have just a regular label with the date time now. When clicking the button in the update panel its refreshing the whole page include the label out side of the update panel