private void updbtn_Click(object sender, RoutedEventArgs e)
{
updid = (StdDG.SelectedItem as Студент).Код_студента;
NewStudent st = new NewStudent();
st.Show();
}
private void NewStd_Click(object sender, RoutedEventArgs e)
{
db.Студент.ToList()[0].Имя = "Илья";
NewStudent st = new NewStudent();
st.Show();
}
