private void PrintPreview(object sender, EventArgs e)
{
PrintOptions po = new PrintOptions(trv_view_exam.SelectedNode);
po.ShowDialog();
whatToPrint = po.SelectedPrintOption;
ppd_print.ShowDialog();
}
private void Print_Preview(object sender, EventArgs e)
{
PrintOptions po = new PrintOptions(trv_explorer.SelectedNode);
po.ShowDialog();
whatToPrint = po.SelectedPrintOption;
ppd_print.ShowDialog();
}