System.Windows.Forms.TreeNode_Old.AddNode C# (CSharp) Method

        public void AddNode(TreeNode_Old node)
        {
            Nodes.Add(node);
            node.Index = Nodes.Count;
            node.Parent = this;
            //if (node.Self == null && node.CreateGO)
            //    node.Self = node.CreateNode();
            node.UpdateContent();
        }
        public void CollapseExpand()