How to Convert PDF to TIFF in C# .NET?

using System;
using System.Drawing;
using System.Drawing.Imaging;
using PQScan.PDFToImage;

namespace PDF2TIFF
{
  class Program
  {
    static void Main(string[] args)
    {
      // Create an instance of PQScan.PDFToImage.PDFDocument object.
      PDFDocument pdfDoc = new PDFDocument();

      // Load a local PDF file.
      pdfDoc.LoadPDF("sample.pdf");

      // Obtain the total page count.
      int count = pdfDoc.PageCount;

      for (int i = 0; i < count; i++)
      {
        // Turn PDF file page to image.
        Bitmap tifImage = pdfDoc.ToImage(i);

        // Save image as tiff image file type.
        tifImage.Save("output" + i + ".tiff", ImageFormat.Tiff);
      }
    }
  }
}

using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using PQScan.PDFToImage;

namespace PDFToTIF
{
  class Program
  {
    static void Main(string[] args)
    {
      // Make a new instance of PQScan.PDFToImage.PDFDocument object.
      PDFDocument pdf = new PDFDocument();

      // Create a file stream with PDF message.
      FileStream stream = new FileStream("sample.pdf", FileMode.Open);

      // Load PDF from file stream.
      pdf.LoadPDF(stream);

      // Set output tif image width.
      int width = pdf.GetPageWidth(0) / 2;

      // Set output tif image height.
      int height = pdf.GetPageHeight(0) / 2;

      // Convert the first PDF page to image with the desired size.
      Bitmap tif = pdf.ToImage(0, width, height);

      // Save image to tif format.
      tif.Save("result.tiff", ImageFormat.Tiff);
    }
  }
}