How Can I Print A Document With Specified Size

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C#

I need to print a document with specified size say width 18.5cm and height 16.5cm. and one more question how can i print multiple document.

my code is given below

class PrintClass:BasicClass
{
public void print()
{

    PrintDialog pd = new PrintDialog();
    PrintDocument pdoc = new PrintDocument();
    PrinterSettings ps = new PrinterSettings();
    PaperSize psize = new PaperSize();
    pdoc.DefaultPageSettings.Landscape = true;
    pd.Document = pdoc;
    pd.Document.DefaultPageSettings.PaperSize = psize;
    pdoc.PrintPage += new PrintPageEventHandler(pdoc_PrintPage);

    DialogResult result = pd.ShowDialog();
    if (result == DialogResult.OK)
    {
        PrintPreviewDialog ppd = new PrintPreviewDialog();
        ppd.Document = pdoc;
        ppd.PrintPreviewControl.Zoom = 1.5;
        ((Form)ppd).WindowState = FormWindowState.Maximized;
        DialogResult ppdResult = ppd.ShowDialog();

    }
}
void pdoc_PrintPage(object sender, PrintPageEventArgs e)
{
    Graphics g = e.Graphics;
    //string str1 = "XYZ";
    //Font fnt1 = new Font("Arial", 12.5f);            
    g.DrawString(str, fnt, new SolidBrush(Color.Black), 10, 10);

}
}