private void print()
{
btnPrint.Visible = false;
PrintForm pf = new PrintForm();
pf.Form = this;
pf.PrinterSettings.DefaultPageSettings.Landscape = true;
pf.PrinterSettings.DefaultPageSettings.Margins.Left = 30;
pf.PrinterSettings.DefaultPageSettings.Margins.Right = 30;
pf.PrinterSettings.DefaultPageSettings.Margins.Top = 30;
pf.PrinterSettings.DefaultPageSettings.Margins.Bottom = 30;
pf.PrintAction = System.Drawing.Printing.PrintAction.PrintToPreview;
pf.Print();
btnPrint.Visible = true;
}