Update entity record status

 SetStateRequest setStateRequest = new SetStateRequest()
                {
                    EntityMoniker = new EntityReference
                    {
                        Id = new Guid(_orderid),
                        LogicalName = "salesorder",
                    },
                    State = new OptionSetValue((int)SalesOrderState.Submitted),
                    Status = new OptionSetValue(3)
                };
                service.Execute(setStateRequest);