private void delete_button_Click(object sender, RoutedEventArgs e)
{
if (deleteCB.SelectedItem == null)
{
MessageBox.Show("Please select an item to delete.");
}
else
{
oldCourse = student.CourseList[deleteCB.SelectedIndex];
student.DeleteCourse(deleteCB.SelectedIndex);
FileReadWrite file = new FileReadWrite();
file.DeleteCourseToFile(student, oldCourse);
ViewCourses vc = new ViewCourses(student);
this.Close();
vc.Show();
}
}