/// <summary>
/// Loads the details of the selected book
/// </summary>
/// <returns>Detailed book</returns>
public async Task LoadDetails()
{
BookManager bm = new BookManager();
string keytmp = Book.OLID_key;
Book = await bm.BookByOLID(Book.OLID_key);
Book.OLID_key = keytmp;
}