DataRowView的Sort方法？ 这代码输出结果一样，为什么？

Question

            DataTable tbl = new DataTable("Customers");
            tbl.Columns.Add("CustomerID", typeof(string));
            tbl.Columns.Add("CompanyName", typeof(string));
            tbl.Rows.Add(new object[] { "ALFKI", "Alfreds Futterkiste" });
            tbl.Rows.Add(new object[] { "WOLZA", "Wolski Zajazd" });            DataView vue = new DataView(tbl);
            vue.Sort = "CompanyName ASC";
            DataRowView row = vue[0];
            Console.WriteLine(row["CompanyName"]);            vue.Sort = "CompanyName DESC";
            Console.WriteLine(row["CompanyName"]);