If an XML Web service method wants to process SOAP headers it does not know about at the time the XML Web service is written, it can process an System.Xml.XmlElement class representing the raw XML of the SOAP header.
Requirements
Namespace: System.Web.Services.Protocols Assembly: System.Web.Services (in System.Web.Services.dll) Assembly Versions: 1.0.5000.0, 2.0.0.0