//ADD BOOK INTO BOOK TABLE => BL
public string AddBookBL(string bookName, string bookAuthor, string bookISBN, double bookPrice, int bookCopies)
{
string isBookValid = BookValidate(bookName, bookAuthor, bookISBN, bookPrice, bookCopies);
if (isBookValid == "true")
{
BookDAL bookDAL = new BookDAL();
bool isDone = bookDAL.AddBookDAL(bookName, bookAuthor, bookISBN, bookPrice, bookCopies);
if (isDone != true)
{
return("Server error, ");
}
else
{
return("true");
}
}
else
{
return(isBookValid);
}
}