public string ValidateRelease()
{
using (BookData bookData = new BookData())
{
Book book = bookData.GetBookById(BookId);
if (book == null)
{
return("Book with this id does not exist");
}
else if (!book.Reserved)
{
return("Book not reserved");
}
else
{
return("");
}
}
}
public bool ValidateEdit()
{
bool validBookId;
using (BookData genreData = new BookData())
{
validBookId = genreData.GetBookById(BookId) != null;
}
bool validGenre;
using (GenreData genreData = new GenreData())
{
validGenre = genreData.GetGenreIdByName(Genre) >= 0;
}
bool validType;
using (TypeData typeData = new TypeData())
{
validType = typeData.GetTypeIdByName(Type) >= 0;
}
bool validAuthorId;
using (AuthorData authorData = new AuthorData())
{
validAuthorId = authorData.GetAuthorById(Author.AuthorId) != null;
}
if (!validGenre ||
!validType ||
!validAuthorId ||
!validBookId ||
String.IsNullOrEmpty(Title) ||
Year < 0 ||
String.IsNullOrEmpty(Isbn))
{
return(false);
}
return(true);
}
