private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {

>Qui dovresti aggiungergli
printDocument1.DefaultPageSettings.PaperSize = ps;

            e.Graphics.PageUnit = GraphicsUnit.Millimeter;
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Center;
            Font grassetto = new Font(this.Font, FontStyle.Bold);
            SolidBrush brush = new SolidBrush(Color.Black);

            e.Graphics.DrawString("*** INTESTAZIONE ***", grassetto, brush,
                new RectangleF(e.MarginBounds.Left, e.MarginBounds.Top, e.MarginBounds.Right - e.MarginBounds.Left, 5), sf);
            
            e.HasMorePages = false;
        }