/// <summary>
/// This metod fills the controls in the GUI with data from a specific index and book
/// in the book list.
/// </summary>
/// <param name="selectedIndex"></param>
private void FillControls(int selectedIndex)
{
tbx_ISBN.Text = myBookManager.GetBook(selectedIndex).ISBN;
tbx_AuthorFirstName.Text = myBookManager.GetBook(selectedIndex).MyAuthor.FirstName;
tbx_AuthorLastName.Text = myBookManager.GetBook(selectedIndex).MyAuthor.LastName;
tbx_Title.Text = myBookManager.GetBook(selectedIndex).MyTitle.MyTitle;
cbx_BookType.SelectedIndex = (int)myBookManager.GetBook(selectedIndex).MyBookGenre;
dtp_DateTimePicker.Value = myBookManager.GetBook(selectedIndex).ReturnDate;
}
