''' <summary>
''' Creates the PDF documenet with square annotation.
''' </summary>
''' <param name="outputPdfFilename">The output PDF filename.</param>
Public Shared Sub CreatePdfSquareAnnotation(outputPdfFilename As String)
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(outputPdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_14)
        Dim page As Vintasoft.Imaging.Pdf.Tree.PdfPage

        ' Add new page
        page = document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4)
        page.Annotations = New Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList(document)
        Dim annotationRectangle As System.Drawing.RectangleF = page.MediaBox
        annotationRectangle.Inflate(-200, -300)

        ' Square annotation
        Dim square As New Vintasoft.Imaging.Pdf.Tree.Annotations.PdfSquareAnnotation(page)
        square.Rectangle = annotationRectangle
        square.BorderWidth = 3
        square.Padding = New Vintasoft.Imaging.PaddingF(square.BorderWidth)
        square.InteriorColor = System.Drawing.Color.Red
        square.Color = System.Drawing.Color.Green
        square.UpdateAppearance()
        page.Annotations.Add(square)

        document.SaveChanges()
    End Using
End Sub

/// <summary>
/// Creates the PDF documenet with square annotation.
/// </summary>
/// <param name="outputPdfFilename">The output PDF filename.</param>
public static void CreatePdfSquareAnnotation(string outputPdfFilename)
{
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(
        outputPdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_14))
    {
        Vintasoft.Imaging.Pdf.Tree.PdfPage page;

        // Add new page
        page = document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4);
        page.Annotations = new Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList(document);
        System.Drawing.RectangleF annotationRectangle = page.MediaBox;
        annotationRectangle.Inflate(-200, -300);

        // Square annotation
        Vintasoft.Imaging.Pdf.Tree.Annotations.PdfSquareAnnotation square = 
            new Vintasoft.Imaging.Pdf.Tree.Annotations.PdfSquareAnnotation(page);
        square.Rectangle = annotationRectangle;
        square.BorderWidth = 3;
        square.Padding = new Vintasoft.Imaging.PaddingF(square.BorderWidth);
        square.InteriorColor = System.Drawing.Color.Red;
        square.Color = System.Drawing.Color.Green;
        square.UpdateAppearance();
        page.Annotations.Add(square);

        document.SaveChanges();
    }
}