and

//Create our own namespaces for the output XmlSerializerNamespaces ns = new XmlSerializerNamespaces(); //Add an empty namespace and empty value ns.Add("", ""); //Create the serializer XmlSerializer slz = new XmlSerializer(someType); //Serialize the object with our own namespaces (notice the overload) slz.Serialize(myXmlTextWriter, someObject, ns);