how to override serialization attributes at runtime

At runtime, you can override serialization attributes. Here is an example:

    class Program
    {
        static void Main(string[] args)
        {
            XmlSerializer ser = new XmlSerializer(typeof(Foo));
            Foo foo1 = (Foo)ser.Deserialize(XmlReader.Create(@"..\..\XMLFile1.xml"));
            Console.WriteLine(foo1.Bar);

            XmlRootAttribute newRoot = new XmlRootAttribute();
            newRoot.ElementName = "Root";
            newRoot.Namespace = "http://example.org/";

            XmlAttributes myAttributes = new XmlAttributes();
            myAttributes.XmlRoot = newRoot;

            XmlAttributeOverrides myOverrides = new XmlAttributeOverrides();
            myOverrides.Add(typeof(Foo), myAttributes);

            ser = new XmlSerializer(typeof(Foo), myOverrides);
            Foo foo2 = (Foo)ser.Deserialize(XmlReader.Create(@"..\..\XMLFile2.xml"));
            Console.WriteLine(foo2.Bar);

        }
    }

    [XmlRoot(ElementName="Root", Namespace="http://example.com/")]
    public class Foo
    {
        public string Bar { get; set; }
    }

The first deserialization consumes

<?xml version="1.0" encoding="utf-8" ?>
<Root xmlns="http://example.com/">
  <Bar>Baz</Bar>
</Root>

the second

<?xml version="1.0" encoding="utf-8" ?>
<Root xmlns="http://example.org/">
  <Bar>Baz</Bar>
</Root>