public void SaveBook(Book book) { BookEnt bookEnt = ConvertEntity.ConvertToBookEnt(book); if (book.BookId == 0) { context.Books.Add(bookEnt); } else { BookEnt dbEntry = context.Books.FirstOrDefault(b => b.BookEntId == book.BookId); if (dbEntry != null) { dbEntry.Name = book.Name; dbEntry.Description = book.Description; dbEntry.Price = book.Price; dbEntry.Category = book.Category; dbEntry.Author = book.Author; dbEntry.Count = book.Count; } } context.SaveChanges(); }