getting soap request and response in xml

we are working with UPS shipment API and there are certain issues we are facing. After contacting UPS technical support, they have asked to provide them with the SOAP envelope (Request/Respose) in xml format.

Kindly assist that how can that be acquired from the code . below is the service call to UPS API.

ShipmentResponse shipmentReponse =
                     shipService.ProcessShipment(shipmentRequest);

any help appreciated.