Adds a prefix and namespace pair to an System.Xml.Serialization.XmlSerializerNamespaces object.
If you want the System.Xml.Serialization.XmlSerializer to qualify the element and attribute names in an XML document, you must XmlSerializerNamespaces.Add(string, string) the prefix and namespace pairs to an System.Xml.Serialization.XmlSerializerNamespaces object.
Any namespaces that you add must conform to the www.w3.org specification Namespaces in XML.