Gridview inside Update Panel

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C#

hi guyz,
why does my gridview inside the updatepanel does not update its record automatically when i click the button without postback, please help,,, here's my code, thnx in advance

<div>
       <br />
       <asp:ScriptManager ID="ScriptManager1" runat="server">
       </asp:ScriptManager>
       <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
    <fieldset>
       <asp:GridView ID="GridView1" runat="server">
       </asp:GridView>
       </fieldset>
       </ContentTemplate>
         </asp:UpdatePanel>

   </div>