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

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

namespace PDF2BMP
{
  class Program
  {
    static void Main(string[] args)
    {
      // Create an instance of PQScan.PDFToImage.PDFDocument object.
      PDFDocument pdfDoc = new PDFDocument();

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

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

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

        // Save image to bmp file type.
        bitmap.Save("output" + i + ".bmp", ImageFormat.Bmp);
      }
    }
  }
}

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

namespace PDFToBMP
{
  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 output bmp image width.
      int width = pdf.GetPageWidth(0) / 2;

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

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

      // Save image to bmp image file format.
      bmp.Save("result.bmp", ImageFormat.Bmp);
    }
  }
}