Thanks
That works. fyi this doesn't:

Orders oOrder = new Orders();
OrderEntity oOrderEntity = new OrderEntity();
oOrder.GetEmptyDataSet();
oOrder.NewRow();
oOrderEntity.CUSTOMERID = "QUICK";
oOrderEntity.EMPLOYEEID = 5;
oOrderEntity.ORDERDATE = DateTime.Today;
oOrderEntity.REQUIREDDATE = DateTime.Today;
oOrderEntity.SHIPPEDDATE = DateTime.Today;
oOrderEntity.SHIPVIA = 3;
oOrderEntity.FREIGHT = 12.34M;
oOrderEntity.SHIPNAME = "QUICK-Stop";
oOrderEntity.SHIPADDRESS = "Taucherstraße 10";
oOrderEntity.SHIPCITY = "Cunewalde";
oOrderEntity.SHIPREGION = "01307";
oOrderEntity.SHIPCOUNTRY = "Germany";
oOrder.Entity=oOrderEntity;
oOrder.SaveDataSet();