在C#中，可以通過使用System.Runtime.Serialization命名空間中的DataContractSerializer類來實現對象的序列化和反序列化。

序列化對象示例代碼：

using System;
using System.IO;
using System.Runtime.Serialization;

[DataContract]
public class Person
{
    [DataMember]
    public string Name { get; set; }
    
    [DataMember]
    public int Age { get; set; }
}

class Program
{
    static void Main()
    {
        Person person = new Person { Name = "Alice", Age = 30 };

        DataContractSerializer serializer = new DataContractSerializer(typeof(Person));
        using (FileStream stream = new FileStream("person.xml", FileMode.Create))
        {
            serializer.WriteObject(stream, person);
        }
    }
}

反序列化對象示例代碼：

using System;
using System.IO;
using System.Runtime.Serialization;

class Program
{
    static void Main()
    {
        DataContractSerializer serializer = new DataContractSerializer(typeof(Person));
        using (FileStream stream = new FileStream("person.xml", FileMode.Open))
        {
            Person person = (Person)serializer.ReadObject(stream);
            Console.WriteLine($"Name: {person.Name}, Age: {person.Age}");
        }
    }
}

以上代碼中，Person類使用DataContract和DataMember屬性來標記需要序列化的屬性，然后通過DataContractSerializer類將對象序列化為XML文件或從XML文件反序列化為對象。