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EVO PDF to Image Converter
EVO PDF to Image Converter can be used in any type of .NET application to convert PDF pages to images. The integration with existing .NET applications is extremely easy and no installation is necessary. The downloaded archive contains the assembly for .NET and a demo application. The full C# source code for the demo application is available in the Samples folder. The converter produces .NET Image objects during conversion that you can save to image files or use for further processing. You can also customize the color space and resolution used during rasterization operation.
Convert PDF pages to images
Create thumbnails of the PDF pages
Customize the color space and resolution of generated images
Convert PDF pages to images in memory or to image files in a folder
Save the PDF pages images in various image formats
Support for password protected PDF documents
Convert to images only a range of PDF pages
Get the number of pages in a PDF document
Get the PDF document title, keywords, author and description
Does not require Adobe Reader or other third party tools
Support for .NET 4.0 framework and later
Documentation and C# samples for all the features
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API Reference
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Code Sample - Rasterize PDF Pages to Images

The code below was taken from the PDF to Image Converter demo application available for download in the PDF to Image converter archive. In this sample an instance of the PdfToImageConverter class is constructed and used to rasterize the PDF document pages to images.
private void btnConvertToImages_Click(object sender, EventArgs e)
{
    if (pdfFileTextBox.Text.Trim().Equals(String.Empty))
    {
        MessageBox.Show("Please choose a source PDF file", "Choose PDF file", MessageBoxButtons.OK);
        return;
    }

    // the source pdf file
    string pdfFileName = pdfFileTextBox.Text.Trim();

    // start page number
    int startPageNumber = int.Parse(textBoxStartPage.Text.Trim());
    // end page number
    // when it is 0 the conversion will continue up to the end of document
    int endPageNumber = 0;
    if (textBoxEndPage.Text.Trim() != String.Empty)
        endPageNumber = int.Parse(textBoxEndPage.Text.Trim());

    // create the converter object and set the user options
    PdfToImageConverter pdfToImageConverter = new PdfToImageConverter();

    pdfToImageConverter.LicenseKey = "0F5PX0pGX09fSVFPX0xOUU5NUUZGRkZfTw==";

    // set the color space of the resulted images
    pdfToImageConverter.ColorSpace = SelectedColorSpace();

    // set the resolution of the resulted images
    pdfToImageConverter.Resolution = int.Parse(textBoxResolution.Text);

    // the demo output directory
    string outputDirectory = Path.Combine(Application.StartupPath, @"DemoFiles\Output");

    Cursor = Cursors.WaitCursor;

    // set the handler to be called when a page was converted
    pdfToImageConverter.PageConvertedEvent += pdfToImageConverter_PageConvertedEvent;            
            
    try
    {
        // call the converter to raise the PageConvertedEvent event when a PDF page is converted
        // the pdfToImageConverter_PageConvertedEvent handler below will be executed for each converted PDF page
        pdfToImageConverter.ConvertPdfPagesToImageInEvent(pdfFileName, startPageNumber, endPageNumber);

        // Alternatively you can use the ConvertPdfPagesToImage() and ConvertPdfPagesToImageFile() methods
        // to convert the PDF pages to images in memory or to image files in a directory

        // uncomment the line below to convert PDF pages in memory to an array of PdfPageImage objects
        //PdfPageImage[] pdfPageImages = pdfToImageConverter.ConvertPdfPagesToImage(pdfFileName, startPageNumber, endPageNumber);

        // uncomment the lines below to convert PDF pages to image files in a directory
        //string outputDirectory = System.IO.Path.Combine(Application.StartupPath, @"DemoFiles\Output");
        //pdfToImageConverter.ConvertPdfPagesToImageFile(pdfFileName, startPageNumber, endPageNumber, outputDirectory, "pdfpage");
    }
    catch (Exception ex)
    {
        // The conversion failed
        MessageBox.Show(String.Format("An error occurred. {0}", ex.Message), "Error");
        return;
    }
    finally
    {
        // uninstall the event handler
        pdfToImageConverter.PageConvertedEvent -= pdfToImageConverter_PageConvertedEvent;

        Cursor = Cursors.Arrow;
    }

    try
    {
        System.Diagnostics.Process.Start(outputDirectory);
    }
    catch (Exception ex)
    {
        MessageBox.Show(string.Format("Cannot open output folder. {0}", ex.Message));
        return;
    }
}

/// <summary>
/// The PageConvertedEvent event handler called after when a PDF page was converted to image
/// The event is raised when the ConvertPdfPagesToImageInEvent() method is used
/// </summary>
/// <param name="args">The handler argument containing the PDF page image and page number</param>
void pdfToImageConverter_PageConvertedEvent(PageConvertedEventArgs args)
{
    // get the image object and page number from even handler argument
    Image pdfPageImageObj = args.PdfPageImage.ImageObject;
    int pageNumber = args.PdfPageImage.PageNumber;

    // save the PDF page image to a PNG file
    string outputPageImage = Path.Combine(Application.StartupPath, @"DemoFiles\Output", "pdfpage_" + pageNumber + ".png");
    pdfPageImageObj.Save(outputPageImage, ImageFormat.Png);

    args.PdfPageImage.Dispose();
}