Printer sittings using C#

 private void button1_Click(object sender, EventArgs e)
        {
                   string exeFolder = Application.StartupPath;
                   string Filepath = Path.Combine(exeFolder, @"Form.pdf");
                    Process printjob = new Process();
                    printjob.StartInfo.FileName = Filepath;
                    printjob.StartInfo.Verb = "Print";
                    printjob.StartInfo.CreateNoWindow = true;
                    printjob.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                    PrinterSettings ps = new PrinterSettings();
                   PrintDocument printdoc= new PrintDocument();
                   printdoc.PrinterSettings = ps;
                   IEnumerable<PaperSize> paperSizes = ps.PaperSizes.Cast<PaperSize>();
                   PaperSize sizeA4 = paperSizes.First<PaperSize>(size => size.Kind == PaperKind.A4);
                    printdoc.DefaultPageSettings.PaperSize = sizeA4;
                    PaperSource oPSource = new PaperSource();
                    oPSource.RawKind = (int)PaperSourceKind.Lower;
                    printdoc.DefaultPageSettings.PaperSource = oPSource;
                    printdoc.PrinterSettings.Copies = 2;            
                    printjob.Start();
}