public bool isOnlineBookExistsInCustomerList(CustomerOnlineBook customerOnlineBook) { List <CustomerOnlineBook> onlineBooks = (from book in dal.customerOnlineBooks where book.onlineBookId.Equals(customerOnlineBook.onlineBookId) && book.customerId.Equals(customerOnlineBook.customerId) select book).ToList <CustomerOnlineBook>(); if (onlineBooks.Count > 0) { return(true); } return(false); }
public void AddOnlineBook(CustomerOnlineBook customerOnlineBook) { if (isOnlineBookExistsInCustomerList(customerOnlineBook) == true) { Console.WriteLine("Online book is already exists in customer list"); } else { using (var newDal = new DBdal()) { newDal.customerOnlineBooks.Add(customerOnlineBook); newDal.SaveChanges(); } } }