public string Save(Book aBook)
{
if (bookGateway.HasBookName(aBook.Title))
{
throw new Exception("This system has this book name.Please try again.");
}
else if (bookGateway.HasISBNNo(aBook.ISbnNo))
{
throw new Exception("This system already have this ISBN No.Please try again.");
}
else
{
return(bookGateway.Save(aBook));
}
}
public string Save(Book abook)
{
if (bookGateway.IsISBNExists(abook.Isbn))
{
return("ISBN exists");
}
if (abook.Isbn.Length != 13)
{
return("ISBN must thirteen 13 characters long.");
}
int rowAffected = bookGateway.Save(abook);
if (rowAffected > 0)
{
return("Book saved succesfully");
}
return("Book saved failed");
}