public string UpdatePurchseOrder(PurchaseOrderVM purchaseOrder, List <AuditDetailVM> auditChanges) { Mapper.CreateMap <PurchaseItemsVM, PurchaseItemsDTO>(); Mapper.CreateMap <PurchaseOrderVM, PurchaseOrderDTO>(); var dto = Mapper.Map <PurchaseOrderDTO>(purchaseOrder); Mapper.CreateMap <AuditDetailVM, AuditDetailDTO>(); var auditDTO = Mapper.Map <List <AuditDetailDTO> >(auditChanges); return(iOrder.UpdatePurchseOrder(dto, auditDTO)); }