Here is an example in C#:

            XmlSerializerNamespaces namespaces = new
XmlSerializerNamespaces();
            namespaces.Add("prefix", "http://example.com/2008/ex1");
            XmlSerializer serializer = new XmlSerializer(typeof(Foo));
            Foo f = new Foo();
            f.Bar = "foobar";
            serializer.Serialize(Console.Out, f, namespaces);

So you create an XmlSerializerNamespaces object, call the Add method to
bind the desired prefix to the namespace URI and then pass that object
as the third argument to the Serialize method.

Thanks for Martin's prompt reply.

Hello Jerry,

It seems Martin has given a great sample and advice.
I just want to check if there is anything else we can help with.
If the issue still persists or there is anything unclear, please feel free
to update here again. We are glad to assist you.

Have a great day,
Best regards,

Wen Yuan
Microsoft Online Community Support
======================================
This posting is provided "AS IS" with no warranties, and confers no rights.