private void BtnNew_Click(object sender, RoutedEventArgs e)
{
StudentUI ui = new StudentUI();
ui.OnAccept += ManageStudent;
ui.Show();
}
private void DgData_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (DgData.SelectedValue != null)
{
StudentUI ui = new StudentUI((Student)DgData.SelectedValue);
ui.OnAccept += ManageStudent;
ui.Show();
}
}