How to disable or enable the node of my treeview

I try with this code, but I can't disable or set not visible the node of my treeview... please I need your help...


<asp:TreeView ID="TreeView1" runat="server" BackColor="White" Font-Names="Verdana" Font-Size="Small" ForeColor="Blue"> <HoverNodeStyle BackColor="White" Font-Bold="True" ForeColor="Black" /> <Nodes> <asp:TreeNode ImageUrl="~/images/pefectivas.jpg" Text="Business" Value="Business"> <asp:TreeNode Text="Info" Value="Info"></asp:TreeNode> <asp:TreeNode Text="Letters" Value="Letters"> </asp:TreeNode> <asp:TreeNode Text="Status" Value=" ...