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();
}
}
}
