public override void undo()
{
_ep.Nodes.Add(_course);
AppForm.getAppForm().getCoursesTreeView().SelectedNode = _course;
_ep.Expand();
AppForm.getAppForm().getCoursesTreeView().SelectedNode.EnsureVisible();
foreach (Course course in _course.getCoursesToHoldTogetherList())
{
course.getCoursesToHoldTogetherList().Add(_course);
}
for (int k = 0; k < _course.getNumberOfLessonsPerWeek(); k++)
{
if (_course.getCoursesToHoldTogetherList().Count == 0)
{
AppForm.CURR_OCTT_DOC.incrUnallocatedLessonsCounter(1);
}
ListViewItem lvi = new ListViewItem();
lvi.Tag = _course;
_ep.getUnallocatedLessonsList().Add(lvi);
string [] courseTeacher = new string[2];
courseTeacher[0] = _course.getFullName();
courseTeacher[1] = _course.getTeacher().getLastName() + " " + _course.getTeacher().getName();
ListViewItem lviGUI = new ListViewItem(courseTeacher);
lviGUI.Tag = _course;
lvi.EnsureVisible();
AppForm.getAppForm().getUnallocatedLessonsListView().Items.Add(lviGUI);
}
AppForm.getAppForm().getStatusBarPanel2().Text = AppForm.CURR_OCTT_DOC.getNumOfUnallocatedLessonsStatusText();
AppForm.getAppForm().getTreeTabControl().SelectedIndex = 0;
}