public MethodResult <CreateSalesOrderResultCodeEnum, SalesOrderHeader> CreateSalesOrder(SalesOrderHeader order) { if (order.DueDate.Day == 3) { return(MethodResult <CreateSalesOrderResultCodeEnum, SalesOrderHeader> .CreateError(CreateSalesOrderResultCodeEnum.OUT_OF_STOCK, "[[[OUT_OF_STOCK]]]")); } ; this.AdventureWorksDb.SalesOrderHeaders.Add(order); try { this.AdventureWorksDb.SaveChanges(); return(MethodResult <CreateSalesOrderResultCodeEnum, SalesOrderHeader> .CreateSuccess(CreateSalesOrderResultCodeEnum.SUCCESS, order)); } catch (Exception ex) { throw new Exception("Can't Save SalesOrder", ex); } }