运算符后缺少操作数

dv = new DataView(dt);
        //筛选(相当于select * from tabMenu where menuParentID = 传入的 parentID)   
        dv.RowFilter = "[Privilege_ID]" + parentID;
        //用foreach遍历dv   
        foreach (DataRowView row in dv)
        {
            //第一次加载时为空   
            if (node == null)
            {
                //创建根节点   
                TreeNode root = new TreeNode();
                //必须与数据库的对应   
                root.Text = row["Description"].ToString();
                root.Value = row["Parent_id"].ToString();
                //添加根节点   
                this.TreeView1.Nodes.Add(root);
                //递归调用方法本身   
                CreateTree(int.Parse(row["Parent_id"].ToString()), root, dt, treeView);
            }
            else
            {
                //添加子节点   
                TreeNode childNode = new TreeNode();
                childNode.Text = row["Description"].ToString();
                childNode.Value = row["Parent_id"].ToString();
                node.ChildNodes.Add(childNode);
                CreateTree(int.Parse(row["Parent_id"].ToString()), childNode, dt, treeView);

            }
        }

dv.RowFilter = "[Privilege_ID]" + parentID;

这句要实现筛选？

dv.RowFilter = "[Privilege_ID]='"+parentID+"'";