update panel in gridview

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C#

ASP.NET

I have used an update panel to show latest records in gridview on click of button without the need to refresh the page.. the code is:

<asp:Button ID="Button1" runat="server" Text="Show"/>

    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
           <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="ObjectDataSource1">
                <Columns>
                <asp:BoundField DataField="Id" HeaderText="Id" SortExpression="Id" />
                    <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />

                </Columns>
            </asp:GridView>
            <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" OldValuesParameterFormatString="original_{0}"
                SelectMethod="GetAll"
                TypeName="NameSelected"
                onobjectcreating="ObjectDataSource1_ObjectCreating">
            </asp:ObjectDataSource>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
        </Triggers>
    </asp:UpdatePanel>

the problem is: on click of button, the grid is not updated.. Any help???