C#

Question

用C#怎么给TreeView添加两个根节点呀
以下是我写的代码：
              OleDbCommand cmd = null;
            this.TV.Nodes.Clear();
            cmd = new OleDbCommand("select * from fenzu", Connectiondatabase.GetOpenCon());
            DataTable dt = new DataTable();
            OleDbDataAdapter sta = new OleDbDataAdapter();
            sta.SelectCommand = cmd;
            sta.Fill(dt);
            TreeNode root = new TreeNode();
            root.Text = "联系人";
            TV.Nodes.Add(root);
            //添加根节点
              for (int i = 0; i < dt.Rows.Count; i++)
            {
                TreeNode node = new TreeNode();
                if (dt.Rows[i][0].ToString() == "0")
                    continue;
                node.Tag = dt.Rows[i][0].ToString();//反添
                  root.Nodes.Add(node);
            }
            TV.Nodes[0].ExpandAll();
            //根节点展开
            Connectiondatabase.GetCloseCon();还需要在哪加代码呀

Answer 1

TreeNode root1 = new TreeNode();
TreeNode root2 = new TreeNode();TreeView.Nodes.Add(root1);
TreeView.Nodes.Add(root2);