ShipmentsCredentials cred = new ShipmentsCredentials(); cred.UserName = "username"; cred.Password = "password"; cred.CultureType = CultureType.English; ShipmentWeightListRequest par = new ShipmentWeightListRequest(); par.ShipmentsCredentials = cred; ShipmentWeight weight1 = new ShipmentWeight(); weight1.HawbNo = "344010500000151"; weight1.Weight = 52.50; par.ShipmentWeightList = new ShipmentWeight[1]; par.ShipmentWeightList[0] = weight1; ShipmentsClient client = new ShipmentsClient(); ShipmentWeightListResponseres = client.UpdateShipmentWeightList(par);