public static int Save(IDomainAccess ds, ProductionDto.Product dto)
            {
                var p = new Product
                {
                    ProductName = dto.ProductName,
                    ProductCategory = ds.Load<ProductCategory>(dto.ProductCategoryId)
                };

                return (int)ds.Save(p);
            }
            public static int Save(IDomainAccess ds, ProductionDto.Product dto)
            {
                var p = new Product
                {
                    ProductName     = dto.ProductName,
                    ProductCategory = ds.Load <ProductCategory>(dto.ProductCategoryId)
                };

                return((int)ds.Save(p));
            }