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Ohh, Thanks Shabbir

Please check out my new article on Add Text WaterMark In PDF Files

i have ude this code in my page .
page run but watermark is not added in pdf.
please help m.
my code

PdfReader pdfReader = new PdfReader(Server.MapPath("321.pdf"));
PdfStamper stamp = new PdfStamper(pdfReader, new System.IO.FileStream(Server.MapPath("watermark.pdf "), System.IO.FileMode.Create));

iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(Server.MapPath(" AIPL-watermark.jpg"));
img.SetAbsolutePosition(100, 100);

for (int j = 1; j < pdfReader.NumberOfPages; j++)
{
PdfContentByte waterMark = stamp.GetUnderContent(1);
waterMark.AddImage(img);
}
stamp.FormFlattening = true;
stamp.Close();
pdfReader.Close();

hey mate great code, I wanted to use it in one of project that creates reports of user tracking data with company name as the watermark on the report.

It was completely new for me and I loved learning this new technique. I am goint to try this for sure. Thanks for sharing such nice resource.

I have decided to use naimish instead of arithforu, you can delete arithforu if you want.