Steps to Render a PDF Page Image

1. Import the trial Developer License:

   License.Import(new StreamReader(@”C:\Users\Joe\license.xml”));

2. Locate the PDF files using OpenFileDialog:

   License.Import(new StreamReader(@”C:\Users\Joe\license.xml”));

3. Define 2 variables to manage navigation of pages and 1 for a PdfDocument Object:

   int currentPage;
   IList pages;
   PdfDocument document;

4. Create an OpenFileDialog that manages selection of files:

   OpenFileDialog OpFile = new OpenFileDialog();
   //show only PDF Files
   OpFile.Filter = “PDF Files (*.pdf)|*.pdf”;

   if (OpFile.ShowDialog() != System.Windows.Forms.DialogResult.OK) return;

5. Create a new PdfDocument Object:

   //Create a new PDFDocument object add the selected file.
   document = new PdfDocument();
   document.Path = OpFile.FileName;

   //Open the selected file
   document.Open();

   //Set the current page to 0
   currentPage = 0;

   // GetPages() traverses the PDF page tree so you really only want to do it once
   pages = document.GetPages();

   //Update the thumbnail area with whatever the current page is.
   UpdateThumbnail(currentPage);

6. Create a UpdateThumbnail Method to manage User Interaction with the form:

   private void UpdateThumbnail(int index)
   {
   if ((index >= 0) && (index < pages.Count)) { currentPage = index; } //Only enable the buttons if there is a page to go to previous.Enabled = currentPage > 0;
   next.Enabled = currentPage < pages.Count – 1;

   //Call Invalidate to capture when the image changes
   pictureBox.Invalidate();

   …

7. Define the page navigation when the user clicks on the buttons:

   private void previous_Click(object sender, EventArgs e)
   {
   UpdateThumbnail(currentPage – 1);
   }

   private void next_Click(object sender, EventArgs e)
   {
   UpdateThumbnail(currentPage + 1);
   }

   …

8. Set up the Picture Box to display an image of the page that is selected:

   if (pages != null)
   {
   PdfPage page = pages[currentPage];
   // draw PDF page to bitmap in real time at 40 dpi
   Bitmap bitmap = page.DrawBitmap(40);

   // 40 dpi works because pages are typically 8.5 x 11 inches and our pictureBox is 512 x 512
   // 8.5 * 40 = 340 pixels
   // 11 * 40 = 440 pixels
   // both of these are less than 512
   }

   …

9. Create keyboard shortcut keys for the next and previous button:

   switch (e.KeyCode)
   {
   case Keys.PageUp:
   UpdateThumbnail(currentPage + 1); // next
   break;

   case Keys.PageDown:
   UpdateThumbnail(currentPage – 1); // previous
   break;

   case Keys.Home:
   UpdateThumbnail(0); // first
   break;

   case Keys.End:
   UpdateThumbnail(pages.Count – 1); // last
   break;
   }