private void BtnCheckOut_Click(object sender, EventArgs e)
{
if (lstSelectBook.SelectedIndex != -1)
{
var selectedItems = lstSelectBook.SelectedItems;
List <Book> uncheckedBooks =
LibraryHelper.GetAllUncheckedBooks();
List <Book> selectedBooks = GetSelectedItems(
selectedItems);
if (LibraryHelper.CheckoutBooks(selectedBooks))
{
MessageBox.Show("Check-Out Successful.");
LoadBoxes();
}
else
{
MessageBox.Show("Check-Out Unsuccessful.");
}
}
else
{
MessageBox.Show("Nothing selected.");
}
}