c# XML序列化与反序列化

原先一直用BinaryFormatter来序列化挺好，可是最近发现在WinCE下是没有办法进行BinaryFormatter操作，很不爽，只能改成了BinaryWriter和BinaryReader来读写，突然想到能不能用XML来序列化？于是在网上查了些资料便写了些实践性代码，做些记录，避免以后忘记。
序列化对象
    public class People
    {
        [XmlAttribute("NAME")]
        public string Name
        { set; get; }
        [XmlAttribute("AGE")]
        public int Age
        { set; get; }
    }
    [XmlRoot("Root")]
    public class Student : People
    {
        [XmlElement("CLASS")]
        public string Class
        { set; get; }
        [XmlElement("NUMBER")]
        public int Number
        { set; get; }
    }
void Main(string[] args)
{
            Student stu = new Student()
            {
                Age = 10,
                Class = "Class One",
                Name = "Tom",
                Number = 1
            };
            XmlSerializer ser = new Xml