private Hashtable NodesStatus = new Hashtable();
        private string SelectNodeFullPath = string.Empty;
        /// <summary>
        /// </summary>
        /// <param name="nodes"></param>
        private void GetTreeNodesStatus(TreeNodeCollection nodes)
            foreach (TreeNode node in nodes)
                if (node.IsExpanded)
                    NodesStatus[node.FullPath] = true;
                    NodesStatus.Remove(node.FullPath);
                if (node.IsSelected)
                    SelectNodeFullPath = node.FullPath;
                GetTreeNodesStatus(node.Nodes);
        /// <summary>
        /// </summary>
        /// <param name="nodes"></param>
        private void SetTreeNodesStatus(TreeNodeCollection nodes)
            foreach (TreeNode node in nodes)
                if (NodesStatus[node.FullPath] != null)
                    node.Expand();
                if (node.FullPath == SelectNodeFullPath)
                    this.tvAuthFuction.SelectedNode = node;