序列化是将对象状态转换为可保持或可传输的形式的过程。序列化的补集是反序列化，后者将流转换为对象。这两个过程一起保证数据易于存储和传输。
1、要序列化对象，首先需要实例化一个XmlSerializer对象，指定要序列化的对象类型，然后实例化一个流/写入器对象，以把文件写入流/文档中。最后一步是在XmlSerializer上调用Serializer()方法，给它传递流/写入器对象和要序列化的对象。
例子：

public static void SerializeProduct()
        {
            //new products object
            var product = new Product
            {
                ProductID = 200,
                CategoryID = 100,
                Discontinued = false,
                ProductName = "Serialize Objects",
                QuantityPerUnit = "6",
                ReorderLevel = 1,
                SupplierID = 1,
                UnitPrice = 1000,
                UnitsInStock = 10,
                UnitsOnOrder = 0
            };

            FileStream stream = File.OpenWrite("product.xml");
            using (TextWriter writer = new StreamWriter(stream))
            {
                XmlSerializer serializer = new XmlSerializer(typeof(Product));
                serializer.Serialize(writer, product);
            }           
        }