Bordure entre colonnes et lignes de la GridView

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 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        CellPadding="4" CellSpacing="4" DataSourceID="SqlDataSource1" 
        ForeColor="#333333" AllowPaging="True" Width="781px">
        <RowStyle BackColor="#FFFBD6" ForeColor="#333333" BorderStyle="Solid" 
            BorderWidth="1px" BorderColor="Black" HorizontalAlign="Center" VerticalAlign="Middle" />
        <EmptyDataRowStyle HorizontalAlign="Center" VerticalAlign="Middle" />
        <Columns>
            <asp:BoundField DataField="Date" HeaderText="Date" SortExpression="Date" />
            <asp:BoundField DataField="HostName" HeaderText="HostName" 
                SortExpression="HostName" />
            <asp:BoundField DataField="Environnement" HeaderText="Environnement" 
                SortExpression="Environnement" />
            <asp:BoundField DataField="Nom Application" HeaderText="Nom Application" 
                SortExpression="Nom Application" ItemStyle-VerticalAlign="Middle" >
<ItemStyle VerticalAlign="Middle"></ItemStyle>
            </asp:BoundField>
            <asp:BoundField DataField="Level" HeaderText="Level" SortExpression="Level" />
            <asp:BoundField DataField="Logger" HeaderText="Logger" 
                SortExpression="Logger" />
            <asp:BoundField DataField="UserName" HeaderText="UserName" 
                SortExpression="UserName" />
            <asp:BoundField DataField="Message" HeaderText="Message" 
                SortExpression="Message" />
        </Columns>
        <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" VerticalAlign="Middle" />
        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BorderColor="Black" BorderWidth="1px" HorizontalAlign="Center" 
            VerticalAlign="Top" />
        <AlternatingRowStyle BackColor="White" HorizontalAlign="Center" 
            VerticalAlign="Middle" />
    </asp:GridView>
La bordure qui sépare les lignes et les colonnes de la GridView ne s'affichent pas