ASP.NET gridview delete linkbutton

I have an ASP.NET GridView that has a LinkButton field for a Delete option on the GridView for each row.  However when I click the Delete LinkButton on the Gridview, it does not do anything.  I have a DELETE command specified on the DataSource that is associated with the Gridview.  I just can't figure out why the Delete command will not fire.  Here is the GridView's code:


<asp:GridView ID="VersionGridView" runat="server" AllowPaging="True"
            AutoGenerateColumns="False" BackColor="White" BorderColor="#E7E7FF"
            BorderStyle="None" BorderWidth="1px" CellPadding="3" DataKeyNames="Id"
            DataSourceID="VersionDataSource" EmptyDataText="No versions."
            onrowcreated="VersionGridView_RowCreated"
            OnRowDeleting="VersionGridView_RowDeleting" PageSize="5"
            style="margin-left: 18px" Width="567px"
            onrowdatabound="VersionGridView_RowDataBound" >
            <RowStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" />
            <Columns>
                    <asp:TemplateField>
                    <ItemTemplate>
                            <asp:LinkButton ID="LinkButtonDelete" CommandName="Delete" Text="Delete" runat="server"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" />
            <PagerStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" HorizontalAlign="Right" />
            <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="#F7F7F7" />
            <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#F7F7F7" />
            <AlternatingRowStyle BackColor="#F7F7F7" />
        </asp:GridView>