private void resultsListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//Gets the selected book from the listbox, then finds the author
int selectedIndex = resultsListBox.SelectedIndex;
selectedBook = foundBooksFiltered[selectedIndex];
PersonBLL selectedAuthor = people[selectedBook.AuthorID];
//Finds the number of copies checked out for the book.
int checkedOut = (from checkOut in logs
where checkOut.BookID == selectedBook.BookID
select checkOut).ToList().Count;
//Display information about the selected book
string output = selectedBook.Details(selectedAuthor, checkedOut);
bookDetailTextBox.Text = output;
}