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关于LINQ XML from SQL

一个从数据库读取数据转换为XML的程序,输出的XML中 属性ID排最后 但是我select语句 要求的ID是第一输出  这个程序 哪里把输出倒序了?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

namespace XMLfromSQL
{
    class Program
    {
        static void Main(string[] args)
        {
            DataClasses1DataContext dataClass = new DataClasses1DataContext();
            //问题:输出的数据是倒序 ID 为最后。 为什么?
            XElement XEdataClass =
                new XElement("customers",
                    from c in dataClass.Customers.AsEnumerable() //linq延迟查询 ,用AsEnumerable把结果转化为内存中的linqtoObject
                    select new XElement("customer",
                        new XAttribute("ID", c.CustomerID),
                        new XAttribute("City", c.City),
                        new XAttribute("Company", c.CompanyName), 
                        from o in c.Orders
                        select new XElement("order",
                            new XAttribute("orderId", o.CustomerID),
                            new XAttribute("orderDay", o.OrderDate.Value.Day),
                            new XAttribute("orderMonth", o.OrderDate.Value.Month),
                            new XAttribute("orderYear", o.OrderDate.Value.Year),
                            new XAttribute("orderTotal", o.Order_Details.Sum(od => od.Quantity * od.UnitPrice))
                            )//end order
                        )//end customer
                    );//end customers
            string xmlFileName = @"D:\C\C#实验室\Chapter24\XMLfromSQL\XMLfromSQL.xml";
            XEdataClass.Save(xmlFileName);

            Console.WriteLine(xmlFileName);
            Console.ReadKey();
        }
    }
}
C# linq xml 数据库 --------------------编程问答--------------------
补充:.NET技术 ,  C#
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