C# Print PDF Document

static int currentPage = 0;
static Document d;
static PrintDocument printDocument;

static void Main(string[] args)
{
    using (FileStream fs = new FileStream(@"..\..\input.pdf", FileMode.Open, FileAccess.Read))
    {
        d = new Document(fs);
        printDocument = new PrintDocument();
        printDocument.DocumentName = d.DocumentInfo.Title;
        printDocument.DefaultPageSettings.Margins.Left = 0;
        printDocument.DefaultPageSettings.Margins.Right = 0;
        printDocument.DefaultPageSettings.Margins.Bottom = 0;
        printDocument.DefaultPageSettings.Margins.Top = 0;
        printDocument.OriginAtMargins = true;

        // uncomment to avoid status dialog
        //printDocument.PrintController = new StandardPrintController();

        printDocument.PrintPage += new PrintPageEventHandler(printPage);
        printDocument.Print();
    }
}

private static void printPage(object sender, PrintPageEventArgs e)
{
    e.HasMorePages = false;
    if (currentPage <= d.Pages.Count)
    {
        e.Graphics.PageUnit = GraphicsUnit.Point;
        Page page = d.Pages[currentPage];

        e.Graphics.MultiplyTransform(GetPrintTransformation(page, e.Graphics.VisibleClipBounds));
        page.Draw(e.Graphics);
        if (currentPage < d.Pages.Count - 1)
        {
            currentPage++;
            e.HasMorePages = true;
        }
    }
}

private static Matrix GetPrintTransformation(Page page, RectangleF printableArea)
{
    Matrix transformation = new Matrix();

    float pdfWidth = (float)page.Width;
    float pdfHeight = (float)page.Height;
    float pdfRatio = pdfWidth / pdfHeight;

    PaperSize paperSize = printDocument.PrinterSettings.PaperSizes[0];
    float paperWidth = ((float)paperSize.Width * 72f) / 100f;
    float paperHeight = ((float)paperSize.Height * 72f) / 100f;

    // It is possible that a driver returns bogus data for the printable area. If that is
    // obviously the case, we are going to ignore the usePrintableArea settings (otherwise
    // we get invalid transforms).
    paperWidth = printableArea.Width;
    paperHeight = printableArea.Height;
    transformation.Translate(printableArea.Left, printableArea.Top);

    float paperRatio = paperWidth / paperHeight;

    float scaledPdfWidth = pdfWidth;
    float scaledPdfHeight = pdfHeight;

    bool rotate = false;
    if ((pdfRatio > 1 && paperRatio < 1) || (pdfRatio < 1 && paperRatio > 1))
    {
        // need to rotate
        rotate = true;
        float temp = scaledPdfWidth;
        scaledPdfWidth = scaledPdfHeight;
        scaledPdfHeight = temp;
        pdfRatio = 1 / pdfRatio;
    }

    float scale = 1;
    if (pdfRatio > paperRatio)
        scale = paperWidth / scaledPdfWidth;
    else
        scale = paperHeight / scaledPdfHeight;

    scaledPdfWidth *= scale;
    scaledPdfHeight *= scale;

    // auto-rotate
    if (rotate)
    {
        transformation.Rotate(-90);
        transformation.Translate(-scaledPdfHeight, 0);
    }

    // scale
    transformation.Scale(scale, scale);

    return transformation;
}