/// <summary>
/// Delete a lesson made by the teacher
/// </summary>
private void DeleteLesson()
{
//If a lesson has been selected
if (CB_Lessons.SelectedIndex > -1)
{
//Open new instance of db class
DBRepository DB = DBRepository.GetInstance();
//Find the lesson by ID
int Lesson_ID = DB.FindLessonIDByName(CB_Lessons.SelectedItem.ToString());
//Delete this lesson from the lessons and from the Groups
DB.DeleteLessonByID(Lesson_ID);
DB.DeleteLessonAtGroupsByID(Lesson_ID);
//Get new list of lessons
GetAllLessons();
MessageBox.Show("Les verwijderd!");
}
else
{
MessageBox.Show("Selecteer item om te verwijderen");
}
}
