Dave
   Order 1
        Order 1 Items
   Order 2
        Order 2 Items
Mike
   Order 5
        Order 5 Items
   Order 7
       Order 7 Items
Sue
   Order 11
        Order 11 Items

using System;
using System.Data;
using System.Web;
using System.Web.UI;
using NineRays.WebControls;

public partial class Demo_DataBinding_Tabular : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            // Create sample data
            DataTable dTable = new DataTable("Orders");

            dTable.Columns.Add("ID");
            dTable.Columns.Add("Title");
            dTable.Columns.Add("URL");

            // Add nodes (OwnerID is null for root nodes)
            dTable.Rows.Add(new object[] { 1, "Developer Tools", "http://www.9rays.net/" });
            dTable.Rows.Add(new object[] { 2, "Spices.Net" });
            dTable.Rows.Add(new object[] { 3, "Spices.Obfuscator" });
            dTable.Rows.Add(new object[] { 4, "Spices.Decompiler" });
            dTable.Rows.Add(new object[] { 5, ".Net Controls" });
            dTable.Rows.Add(new object[] { 6, "FlyGrid.Net" });
            dTable.Rows.Add(new object[] { 7, "FlyTreeView for ASP.NET 1.1" });
            dTable.Rows.Add(new object[] { 8, "FlyTreeView for ASP.NET 2.0" });


            // Bind the treeview
            flyTreeView.DataSource = CreateHierarchichal(dTable);
            flyTreeView.DataBind();

        }
    }

    private IHierarchicalEnumerable CreateHierarchichal(DataTable datatale)
    {
        // this is the way we can create IHierarchicalEnumerable from every table
        return FlyTreeView.ConvertTabularDataToHierarchical(datatale, "ID", "ID");
    }
    protected void flyTreeView_NodeDataBound(object sender, FlyTreeNodeEventArgs e)
    {
        if (e.Node.Level > 1) return;


        // THERE SHOULD SOME CALL TO DATA SOURCE TO GET VALID DATA FOR CHILD NODES
            DataTable dTable = new DataTable("Orders");

            dTable.Columns.Add("ID");
            dTable.Columns.Add("Title");
            dTable.Columns.Add("NewURLField");

            // Add nodes (OwnerID is null for root nodes)
            dTable.Rows.Add(new object[] { 1, "Developer Tools", "http://www.9rays.net/"});
            dTable.Rows.Add(new object[] { 2, "Spices.Net" });


        // for every created node
        e.Node.ChildNodes.DataSource = CreateHierarchichal(dTable);
        e.Node.ChildNodes.DataBind();
    }
}