using System; using System.IO; using System.Xml.Serialization; public class Person { public string Name { get; set; } public int Age { get; set; } } public class Program { public static void Main(string[] args) { Person person = new Person() { Name = "John Smith", Age = 30 }; XmlSerializer serializer = new XmlSerializer(typeof(Person)); var stream = new FileStream("person.xml", FileMode.Create); serializer.Serialize(stream, person); stream.Close(); } }In this example, a new Person object is created, which includes a name and age value. A new XmlSerializer is created using the typeof() operator to determine the type of the object being serialized. Finally, the serialized XML is written to a file named "person.xml". Overall, the System.Xml.Serialization namespace is included in the .NET Framework Class Library, which is a standard package library for C# applications on Windows.