public Product SaveProduct(Product product) { try { Product dbProduct = null; if (product.ProductId == 0) { _efDatabaseContext.GetProducts.Add(product); } else { dbProduct = _efDatabaseContext.FindProduct(product.ProductId); if (dbProduct == null) { throw new ArgumentNullException(); } else { dbProduct.Name = product.Name; dbProduct.Description = product.Description; dbProduct.Price = product.Price; dbProduct.Category = product.Category; } } _efDatabaseContext.SaveProductChanges(); return(product); } catch { throw; } }