private void Wnd_MarkAdded(object sender, MarkEventArgs e)
{
MessageBox.Show(e.Mark.ToString());
students.Where(x => x.Name == e.StudentName).Single().Marks.Add(e.Mark);
students.Select(x => x.Name).ToArray();
}
private void Wnd_MarkChanged(object sender, MarkEventArgs e)
{
var selItem = students.First(x => x.FIO == e.StudentName);
selItem.Marks = e._Marks;
}
