Apply a stamp on every page on random position and with a slight rotation

Ok, in order to achieve my question I used C# and iTextSharp framework.

This is the code. The code is writen in Visual Studio and you need to add a reference to itextsharp.dll to the project.

Doc1.pdf is the source PDF in which I would like to add the stamps.

JD.wmf and DPI.wmf are my images that I use as stamps

Result.pdf is the result pdf with applied stamps.

using iTextSharp.text;

using iTextSharp.text.pdf;

using System;

using System.IO;

namespace ConsoleApplication

{

    class MyCl1

    {

        static Random random1 = new Random();

        public static void Main()

        {

            using (Stream inputPdfStream = new FileStream("e:\\Doc1.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))

            using (Stream inputImageStream = new FileStream("e:\\JD.wmf", FileMode.Open, FileAccess.Read, FileShare.Read))

            using (Stream inputImageStream2 = new FileStream("e:\\DPI.wmf", FileMode.Open, FileAccess.Read, FileShare.Read))

            using (Stream outputPdfStream = new FileStream("e:\\result.pdf", FileMode.Create, FileAccess.Write, FileShare.None))

            {

                var reader = new PdfReader(inputPdfStream);

                var stamper = new PdfStamper(reader, outputPdfStream);

                int numberOfPages = reader.NumberOfPages;

                Image jD = Image.GetInstance(inputImageStream);

                Image dPI = Image.GetInstance(inputImageStream2);

                float fJD, fDPI;

                for (int i = 1; i <= numberOfPages; i++)

                {

                    var pdfContentByte = stamper.GetOverContent(i);

                    fJD = rand1(370,425);

                    fDPI = rand1(15, 50);

                    jD.SetAbsolutePosition(fJD, fDPI);

                    jD.RotationDegrees = rand1(-20,20);

                    dPI.SetAbsolutePosition(fJD, fDPI);

                    dPI.RotationDegrees = rand1(-20, 20);

                    pdfContentByte.AddImage(jD);

                    pdfContentByte.AddImage(dPI);

                }

                stamper.Close();

                System.Diagnostics.Process.Start("e:\\result.pdf");

            }

        }

        public static float rand1(double minNumber, double maxNumber)

        {

            return (float) (random1.NextDouble() * (maxNumber - minNumber) + minNumber);

        }

    }

}