private void createPdfButton_Click(object sender, EventArgs e)
{
    // Create a PDF document
    Document pdfDocument = new Document();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    pdfDocument.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

    Cursor = Cursors.WaitCursor;
    string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\Image_Elements.pdf";
    try
    {
        // The result of adding elements to PDF document
        AddElementResult addElementResult = null;

        // The titles font used to mark various sections of the PDF document
        PdfFont titleFont = pdfDocument.AddFont(new Font("Times New Roman", 12, FontStyle.Bold, GraphicsUnit.Point));
        PdfFont subtitleFont = pdfDocument.AddFont(new Font("Times New Roman", 8, FontStyle.Bold, GraphicsUnit.Point));

        // The position on X anf Y axes where to add the next element
        float yLocation = 5;
        float xLocation = 5;

        // Create a PDF page in PDF document
        PdfPage pdfPage = pdfDocument.AddPage();

        // Add section title
        TextElement titleTextElement = new TextElement(xLocation, yLocation, "Images Scaling", titleFont);
        titleTextElement.ForeColor = Color.Black;
        addElementResult = pdfPage.AddElement(titleTextElement);
        yLocation = addElementResult.EndPageBounds.Bottom + 10;
        pdfPage = addElementResult.EndPdfPage;

        float titlesYLocation = yLocation;

        // Add an unscaled image

        // Add section title
        TextElement subtitleTextElement = new TextElement(xLocation, titlesYLocation, "Unscaled small image with normal resolution", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        addElementResult = pdfPage.AddElement(subtitleTextElement);

        pdfPage = addElementResult.EndPdfPage;
        float imagesYLocation = addElementResult.EndPageBounds.Bottom + 10;

        string imagePath = @"DemoAppFiles\Input\Images\picture_small.jpg";
        ImageElement unscaledImageElement = new ImageElement(xLocation, imagesYLocation, imagePath);
        addElementResult = pdfPage.AddElement(unscaledImageElement);

        RectangleF scaledDownImageRectangle = new RectangleF(addElementResult.EndPageBounds.Right + 30, addElementResult.EndPageBounds.Y,
                    addElementResult.EndPageBounds.Width, addElementResult.EndPageBounds.Height);

        // Add a large image scaled down to same size in PDF

        // Add section title
        subtitleTextElement = new TextElement(scaledDownImageRectangle.X, titlesYLocation, "Scaled down large image has higher resolution", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        pdfPage.AddElement(subtitleTextElement);

        imagePath = @"DemoAppFiles\Input\Images\picture_large.jpg";
        ImageElement scaledDownImageElement = new ImageElement(scaledDownImageRectangle.X, scaledDownImageRectangle.Y, scaledDownImageRectangle.Width, imagePath);
        AddElementResult scaledDownImageResult = pdfPage.AddElement(scaledDownImageElement);

        // Add a border around the scaled down image
        RectangleElement borderElement = new RectangleElement(scaledDownImageRectangle);
        pdfPage.AddElement(borderElement);

        // Add an unscaled small image

        float columnX = scaledDownImageResult.EndPageBounds.Right + 30;

        // Add section title
        subtitleTextElement = new TextElement(columnX, titlesYLocation, "Unscaled small image", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        pdfPage.AddElement(subtitleTextElement);

        imagePath = @"DemoAppFiles\Input\Images\picture_smaller.jpg";
        unscaledImageElement = new ImageElement(columnX, imagesYLocation, imagePath);
        AddElementResult unscaledImageResult = pdfPage.AddElement(unscaledImageElement);

        RectangleF unscaledImageRectangle = unscaledImageResult.EndPageBounds;

        // Add an enlarged image

        // Add section title
        subtitleTextElement = new TextElement(columnX, unscaledImageRectangle.Bottom + 10, "Enlarged small image has lower resolution", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        AddElementResult enlargedImageTitle = pdfPage.AddElement(subtitleTextElement);

        float enlargedImageWidth = unscaledImageRectangle.Width + 35;

        imagePath = @"DemoAppFiles\Input\Images\picture_smaller.jpg";
        ImageElement enlargedImageElement = new ImageElement(columnX, enlargedImageTitle.EndPageBounds.Bottom + 10, enlargedImageWidth, imagePath);
        // Allow the image to be enlarged
        enlargedImageElement.EnlargeEnabled = true;
        AddElementResult enalargedImageResult = pdfPage.AddElement(enlargedImageElement);

        yLocation = addElementResult.EndPageBounds.Bottom + 10;

        // Scale an image preserving the aspect ratio

        titlesYLocation = yLocation;

        // Add section title
        subtitleTextElement = new TextElement(xLocation, titlesYLocation, "Scaled down image preserving aspect ratio", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        addElementResult = pdfPage.AddElement(subtitleTextElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 10;

        RectangleF boundingRectangle = new RectangleF(xLocation, yLocation, scaledDownImageRectangle.Width, scaledDownImageRectangle.Width);
        imagesYLocation = boundingRectangle.Y;

        imagePath = @"DemoAppFiles\Input\Images\landscape.jpg";
        ImageElement keepAspectImageElement = new ImageElement(boundingRectangle.X, imagesYLocation, boundingRectangle.Width, boundingRectangle.Width, true, imagePath);
        addElementResult = pdfPage.AddElement(keepAspectImageElement);

        borderElement = new RectangleElement(boundingRectangle);
        borderElement.ForeColor = Color.Black;
        pdfPage.AddElement(borderElement);

        // Scale an image without preserving aspect ratio
        // This can produce a distorted image

        boundingRectangle = new RectangleF(addElementResult.EndPageBounds.Right + 30, addElementResult.EndPageBounds.Y, scaledDownImageRectangle.Width, scaledDownImageRectangle.Width);

        // Add section title
        subtitleTextElement = new TextElement(boundingRectangle.X, titlesYLocation, "Scaled down image without preserving aspect ratio", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        pdfPage.AddElement(subtitleTextElement);

        imagePath = @"DemoAppFiles\Input\Images\landscape.jpg";
        ImageElement notKeepAspectImageElement = new ImageElement(boundingRectangle.X, imagesYLocation, boundingRectangle.Width, boundingRectangle.Width, false, imagePath);
        addElementResult = pdfPage.AddElement(notKeepAspectImageElement);

        borderElement = new RectangleElement(boundingRectangle);
        borderElement.ForeColor = Color.Black;
        pdfPage.AddElement(borderElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 20;

        // Add transparent images

        // Add section title
        titleTextElement = new TextElement(xLocation, yLocation, "Transparent Images", titleFont);
        titleTextElement.ForeColor = Color.Black;
        addElementResult = pdfPage.AddElement(titleTextElement);
        yLocation = addElementResult.EndPageBounds.Bottom + 10;
        pdfPage = addElementResult.EndPdfPage;

        imagePath = @"DemoAppFiles\Input\Images\transparent.png";
        ImageElement trasparentImageElement = new ImageElement(xLocation, yLocation, 150, imagePath);
        addElementResult = pdfPage.AddElement(trasparentImageElement);

        imagePath = @"DemoAppFiles\Input\Images\rose.png";
        trasparentImageElement = new ImageElement(addElementResult.EndPageBounds.Right + 60, yLocation + 20, 150, imagePath);
        pdfPage.AddElement(trasparentImageElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 20;

        // Rotate images

        // Add section title
        titleTextElement = new TextElement(xLocation, yLocation, "Rotated Images", titleFont);
        titleTextElement.ForeColor = Color.Black;
        addElementResult = pdfPage.AddElement(titleTextElement);
        yLocation = addElementResult.EndPageBounds.Bottom + 10;
        pdfPage = addElementResult.EndPdfPage;

        // Add a not rotated image
        imagePath = @"DemoAppFiles\Input\Images\compass.png";
        ImageElement noRotationImageElement = new ImageElement(xLocation, yLocation, 125, imagePath);
        addElementResult = pdfPage.AddElement(noRotationImageElement);

        float imageXLocation = addElementResult.EndPageBounds.X;
        float imageYLocation = addElementResult.EndPageBounds.Y;
        float imageWidth = addElementResult.EndPageBounds.Width;
        float imageHeight = addElementResult.EndPageBounds.Height;

        // The rotated coordinates system location
        float rotatedImageXLocation = imageXLocation + imageWidth + 20 + imageHeight;
        float rotatedImageYLocation = imageYLocation;

        // Add the image rotated 90 degrees
        ImageElement rotate90ImageElement = new ImageElement(0, 0, 125, imagePath);
        rotate90ImageElement.Translate(rotatedImageXLocation, rotatedImageYLocation);
        rotate90ImageElement.Rotate(90);
        pdfPage.AddElement(rotate90ImageElement);

        rotatedImageXLocation += 20 + imageWidth;
        rotatedImageYLocation = imageYLocation + imageHeight;

        // Add the image rotated 180 degrees
        ImageElement rotate180ImageElement = new ImageElement(0, 0, 125, imagePath);
        rotate180ImageElement.Translate(rotatedImageXLocation, rotatedImageYLocation);
        rotate180ImageElement.Rotate(180);
        pdfPage.AddElement(rotate180ImageElement);

        rotatedImageXLocation += 20;
        rotatedImageYLocation = imageYLocation + imageWidth;

        // Add the image rotated 270 degrees
        ImageElement rotate270ImageElement = new ImageElement(0, 0, 125, imagePath);
        rotate270ImageElement.Translate(rotatedImageXLocation, rotatedImageYLocation);
        rotate270ImageElement.Rotate(270);
        pdfPage.AddElement(rotate270ImageElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 20;

        // Save the PDF document in a memory buffer
        byte[] outPdfBuffer = pdfDocument.Save();

        // Write the memory buffer in a PDF file
        System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
    }
    catch (Exception ex)
    {
        // The PDF creation failed
        MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message));
        return;
    }
    finally
    {
        // Close the PDF document
        pdfDocument.Close();

        Cursor = Cursors.Arrow;
    }

    // Open the created PDF document in default PDF viewer
    try
    {
        System.Diagnostics.Process.Start(outPdfFile);
    }
    catch (Exception ex)
    {
        MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message));
    }
}