private void Print(string printer)
    {
        PrintDocument PrintDoc = new PrintDocument();

        PrintDoc.PrinterSettings.PrinterName = printer;

        PrintDoc.PrintPage += new PrintPageEventHandler(PrintPage);
        PrintDoc.Print();
    }

    void PrintPage(object sender, PrintPageEventArgs e)
    {
        e.Graphics.DrawLine(new Pen(Color.Black), new Point(0, 0), new Point(100, 100));
        e.Graphics.DrawString("Hello World", new Font("Times New Roman", 12), new SolidBrush(Color.Black), new Point(45, 45));

    }

<field1>
    <x> 2cm </x>
    <y> 1cm </y>
    <text> textfield1 </text>
</field1>
<field2>
     ....

printDocument.DefaultPageSettings.PaperSize = new PaperSize("Custom Name", width, height);
printDocument.DefaultPageSettings.Landscape = true;

void printDocument_PrintPage(object sender, PrintPageEventArgs e)
{
    if (printDocument.PrintController.IsPreview)
    {
        Image image = Image.FromFile("ScannedImagePath");
        e.Graphics.DrawImage(image,0,0)
    }
    // print other text here after drawing the background
}