private void UpdateAuthors()
{
_authors = AuthorDataProvider.GetAuthors();
AuthorComboBox.ItemsSource = _authors;
}
private void FillOutFields(Book selectedbook)
{
BookTitleTextBox.Text = selectedbook.Title;
BookIsbnTextBox.Text = selectedbook.ISBN;
PublisherTextBox.Text = selectedbook.Publisher;
PublishDatePicker.SelectedDate = selectedbook.ReleaseDate;
GenreTextBox.Text = selectedbook.Genre;
PagesTextBox.Text = selectedbook.Pages.ToString();
IList <Author> authors = AuthorDataProvider.GetAuthors();
AuthorComboBox.ItemsSource = authors;
var bookauthor = AuthorDataProvider.GetAuthorByBookId(selectedbook.BookId);
AuthorComboBox.SelectedItem = bookauthor;
AuthorComboBox.Text = bookauthor.ToString();
}