file.Save(this.TemporaryFolder + "/Sample.pdf", org.pdfclown.files.SerializationModeEnum.Standard);

org.pdfclown.files.File myFile = new org.pdfclown.files.File((this.TemporaryFolder + "/Sample.pdf"));

using (myFile)
{
    Document myDocument = myFile.Document;
        Pages myPages = document.Pages;

        Page myPage = myPages[0];
        SizeF imageSize = myPage.Size;
        Renderer renderer = new Renderer();
        Image image = renderer.Render(myPage, imageSize);

        image.Save(this.TemporaryFolder + "/Sample.bmp", ImageFormat.Bmp);
}