private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
Otdelenie otdelenie = (Otdelenie)comboBox1.SelectedItem;
comboBox2.DataSource = otdelenie.group;
comboBox2.DisplayMember = "Name";
}
private void button1_Click_1(object sender, EventArgs e)
{
Otdelenie otdelenie = new Otdelenie {
Name = textBox1.Text, group = new List <Group>()
};
dB.otdelenies.Add(otdelenie);
dB.Save();
Close();
}