Hi venucobol,

first add root node and after that add child node:

    protected void Page_Load(object sender, EventArgs e)
    {
        Node rootNode = new Node();
        rootNode.Text = "Root";

        this.UltraWebTree1.Nodes.Add(rootNode);

        Node childNode = new Node();
        childNode.Text = "Child Node";

        this.UltraWebTree1.Nodes[0].Nodes.Add(childNode);
    }