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<%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

        void TreeView1_TreeNodePopulate(object s, TreeNodeEventArgs e)
        {
            for (int i=0;i<5;i++)
            {
                TreeNode newNode = new TreeNode();
                newNode.Text  = String.Format("{0}.{1}", e.Node.Text, i);
                newNode.PopulateOnDemand = true;
                e.Node.ChildNodes.Add(newNode);
            }
        }



    TreeView Populate On Demand


    
    

    <%=DateTime.Now.ToString("T") %>
            ID="TreeView1"
        ExpandDepth="0"
        OnTreeNodePopulate="TreeView1_TreeNodePopulate"
        Runat="server">
        
                    PopulateOnDemand="true"
            Text="Node 0" />