Repeater and Eval

Hello,


I have the code below. I'd like to add a "if" to display only the hyperlink
(the first) only when Url is not empty.

How can I do that ?

Regards,






        <asp:Repeater runat="server" ID="menu"
DataSourceID="SiteMapDataSource1" EnableViewState="False">
                        <ItemTemplate>
                            <li>

                                <asp:HyperLink runat="server"
NavigateUrl='<%# Eval("Url") %>'><%# Eval("Title") %></asp:HyperLink>

                                <asp:Repeater runat="server" DataSource='<%#
((SiteMapNode) Container.DataItem).ChildNodes %>'>
                                    <HeaderTemplate>
                                        <ul>
                                    </HeaderTemplate>

                                    <ItemTemplate>
                                        <li>
                                            <asp:HyperLink runat="server"
NavigateUrl='<%# Eval("Url") %>'><%# Eval("Title") %></asp:HyperLink>
                                        </li>
                                    </ItemTemplate>

                                    <FooterTemplate>
                                        </ul>
                                    </FooterTemplate>
                                </asp:Repeater>
                            </li>
                        </ItemTemplate>
                    </asp:Repeater>

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