How do I set auto cut with roll printing in WPF

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WPF

printing

C#7.0

I am printing an image in WPF. The image prints well but the printer (a Thermal Printer) cuts the printed job after reaching an A4 length size thus leaving a whole lot of empty space below and wasting paper. I want the thermal printer to cut the print job after printing the image.

What I have tried:

//instantiate print
                dd = new PrintDocument();
                PaperSize ps = new PaperSize("Size", 300, 400); this is the size of paper thati want printed out. i mean once the print job completes at a height of 400, the paper should be cut by the printer
                var src = dd.PrinterSettings.PaperSources;
                dd.DefaultPageSettings.PaperSize = ps;
                ps.PaperName = "Roll Paper";
                dd.OriginAtMargins = false;
                dd.PrinterSettings.DefaultPageSettings.Margins.Bottom = 0;//i thought this will do the job but unfortunately not
                dd.PrinterSettings.DefaultPageSettings.PaperSize = ps;
                
                    dd.PrintPage += (sed, args) => dd_PrintPage(image, args);
                    dd.Print();

void dd_PrintPage(object sed, PrintPageEventArgs e)
        {
            var img = sed as System.Drawing.Image;
            e.Graphics.DrawImage(img, new PointF(0, 0),);
        }