在form 窗体 利用xml和xsl来实现表的嵌套

先创建数据然后生成相应的xml文件
 DataSet ds = new DataSet();
            #region Parent Table
            DataTable dt1 = new DataTable("Parent");
            dt1.Columns.Add(new DataColumn("ParentID", typeof(int)));
            dt1.Columns.Add(new DataColumn("Text", typeof(string)));
            //UniqueConstraint uc = new UniqueConstraint("ParentIDKey", dt1.Columns[0], true);
            //dt1.Constraints.Add(uc);
            for (int i = 1; i < 10; i++)
            {
                dt1.Rows.Add(i, "parent" + i.ToString());
            }
            #endregion
            #region ChildTable
            DataTable dt2 = new DataTable("Child");
            dt2.Columns.Add(new DataColumn("ChildID", typeof(int)));
            dt2.Columns.Add(new DataColumn("Text", typeof(string)));
            dt2.Columns.Add(new DataColumn("ParentID", typeof(int)));
            //UniqueConstraint uc2 = new UniqueConstraint("Chil