我从这里How to Deserialize XML document复制了xml文档

<?xml version="1.0" encoding="utf-8"?>
<CarCollection>
<Cars>
  <Car>
    <StockNumber>1020</StockNumber>
    <Make>Nissan</Make>
    <Model>Sentra</Model>
  </Car>
  <Car>
    <StockNumber>1010</StockNumber>
    <Make>Toyota</Make>
    <Model>Corolla</Model>
  </Car>
  <Car>
    <StockNumber>1111</StockNumber>
    <Make>Honda</Make>
    <Model>accord</Model>
  </Car>
</Cars>
</CarCollection>

我将该代码与从/ paste special / paste xml生成的类一起用作类

using System;
using System.IO;
using system.xml.Serialization;

namespace DeSerialize
{
    class Program
    {
        static void Main(string[] args)
        {
            XmlSerializer serializer =
        new XmlSerializer(typeof(CarCollectionCar));

            // Declare an object variable of the type to be deserialized.
            CarCollectionCar i;

            using (Stream reader = new FileStream("cars.xml",FileMode.Open))
            {
                // Call the Deserialize method to restore the object's state.
                i = (CarCollectionCar)serializer.Deserialize(reader);
            }

            // Write out the properties of the object.
            Console.Write(
            // i.StockNumber + "\t" +
            i.StockNumber + "\t" +
            //i.StockNumber + "\t" +
            i.Model + "\t" +
            i.Make);


        }
    }


    [Serializable()]
    public partial class CarCollection
    {

        /// <remarks/>
        [XmlArrayItem("Car",Isnullable = false)]
        public CarCollectionCar[] Cars { get; set; }
    }

    /// <remarks/>
    [Serializable()]
    [System.ComponentModel.DesignerCategory("code")]
    [XmlType(AnonymousType = true)]
    public partial class CarCollectionCar
    {

        /// <remarks/>
        public ushort StockNumber { get; set; }

        /// <remarks/>
        public string Make { get; set; }

        /// <remarks/>
        public string Model { get; set; }
    }


}

我收到错误

Unhandled Exception: System.InvalidOperationException: There is an error in XML 
document (2,2). ---> System.InvalidOperationException: <CarCollection xmlns=''> 
was not expected.
       at 
microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderCarCollectionCar.Read3_CarCollectionCar()
       --- End of inner exception stack trace ---
   at system.xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader,String encodingStyle,XmlDeserializationEvents events)
   at system.xml.Serialization.XmlSerializer.Deserialize(Stream stream)
   at DeSerialize.Program.Main(String[] args)

如何解决问题并输出所需的汽车参数？