private void CreateNodes()
        {
            if (_SeriesCatalog == null)
            {
                return;
            }

            treeView1.BeginUpdate();
            _TreeModel.Nodes.Clear();
            var root_node = new Node(_SeriesCatalog.ODM.Name)
            {
                Image = Resources.DatabaseServer16,
                Tag   = _SeriesCatalog.ODM
            };

            _SeriesCatalog.GroupMethod = _GroupMethod;
            var records = _SeriesCatalog.Group();
            var nodes   = _NodeCreator.Creat(records);

            foreach (var node in nodes)
            {
                root_node.Nodes.Add(node);
            }
            _TreeModel.Nodes.Add(root_node);
            treeView1.EndUpdate();
        }