private void DeleteI_Click(object sender, RoutedEventArgs e)
{
if (listBoxTermI.SelectedItem != null)
{
_contentManager.DeleteWeek((listBoxTermI.SelectedItem as Week).ID, _selecetedGrade);
TermI.Remove(listBoxTermI.SelectedItem as Week);
textBoxI.Text = "";
SavedI = false;
EditI.IsEnabled = false;
DeleteI.IsEnabled = false;
ConfirmI.IsEnabled = true;
if (TermII.Count == 0 && TermI.Count == 0 && TermIII.Count == 0)
{
emptyI = true;
}
}
}
