private void ExtractAnnots_Click(object sender, EventArgs e)    {        int dpi = 300;        Rectangle r;        List<Rectangle> annotList = new List<Rectangle>();        QP.LoadFromFile("samplefile.pdf", "");        for (int p = 1; p <= QP.PageCount(); p++)        {            QP.SelectPage(p);  // Select the current page.            QP.SetOrigin(1);   // Set origin to top left.            annotList.Clear();            for (int i = 1; i <= QP.AnnotationCount(); i++)            {                if (QP.GetAnnotStrProperty(i, 101) == "Highlight")                {                    r = new Rectangle((int)(QP.GetAnnotDblProperty(i, 105) * dpi / 72.0),  // x                                      (int)(QP.GetAnnotDblProperty(i, 106) * dpi / 72.0),  // y                                      (int)(QP.GetAnnotDblProperty(i, 107) * dpi / 72.0),  // w                                      (int)(QP.GetAnnotDblProperty(i, 108) * dpi / 72.0)); // h                    annotList.Add(r); // Add the bounding box to the annotation list for this page.                    string s = String.Format("page={0}: x={1} y={2} w={3} h={4}\n", p, r.X, r.Y, r.Width, r.Height);                    OutputTxt.AppendText(s);                }            }            // Now we have a list of annotations for the current page.            // Delete the annotations from the PDF in memory so we don't render them.            for (int i = QP.AnnotationCount(); i >= 0;  i--)                   QP.DeleteAnnotation(i);            QP.RenderPageToFile(dpi, p, 0, "page.bmp");   // 300 dpi, 0=bmp            Bitmap bmp = Image.FromFile("page.bmp") as Bitmap;             for (int i=0;i<annotList.Count;i++)            {                Bitmap cropped = bmp.Clone(annotList, bmp.PixelFormat);                string filename = String.Format("annot_p{0}_{1}.bmp", p, i+1);                cropped.Save(filename);            }            bmp.Dispose();        }        QP.RemoveDocument(QP.SelectedDocument());    }