How to Convert PDF to JPG/JPEG in C# .NET?

using System;
using System.Drawing;
using System.Drawing.Imaging;
using PQScan.PDFToImage;
namespace PDF2JPG
{
  class Program
  {
    static void Main(string[] args)
    {
      // Create an instance of PQScan.PDFToImage.PDFDocument object.
      PDFDocument pdfDoc = new PDFDocument();

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

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

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

        // Save image with jpg file type.
        jpgImage.Save("output" + i + ".jpg", ImageFormat.Jpeg);
      }
    }
  }
}

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

namespace PDFToJPG
{
  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 information
      FileStream stream = new FileStream("sample.pdf", FileMode.Open);

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

      // Set the width of output jpeg image.
      int width = pdf.GetPageWidth(0) / 2;

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

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

      // Save image to jpg format.
      jpg.Save("result.jpeg", ImageFormat.Jpeg);
    }
  }
}