填充树节点

        Endv.DataHelper myHelper = new Endv.DataHelper();
            DataSet ds = myHelper.GetDataSet("select * from Right");

            DataTable dt = ds.Tables[0];

            //1
            DataRow[] drParent = dt.Select(“PID = '0'");

            foreach (DataRow dr in drParent)
            {
                TreeNode Node = tree1.Nodes.Add(dr["Name"].ToString());
                Node.Tag = dr["ID"].ToString();
                //2
                DataRow[] drChild = dt.Select("F_PID = '" + dr["ID"].ToString() + "'");
                foreach (DataRow dr1 in drChild)
                {
                    TreeNode cNode = Node.Nodes.Add(dr1["Name"].ToString());
                    cNode.Tag = dr1["ID"].ToString();
                }
            }

            ds.Dispose();