how to add watermark (text or image) in existing pdf in c#.I want the watermark in all the pages of the pdf .
I tired by itextsharp but the watermark is displaying in only last page of the pdf.
I want watermark in all pages
public void CreateTemplate(string watermarkText, string targetFileName)
{
var document = new Document();
var pdfWriter = PdfWriter.GetInstance(document, new FileStream(targetFileName, FileMode.Create));
var font = new iTextSharp.text.Font(iTextSharp.text.Font.HELVETICA, 60, iTextSharp.text.Font.NORMAL, iTextSharp.text.Color.LIGHT_GRAY);
document.Open();
ColumnText.ShowTextAligned(pdfWriter.DirectContent, Element.ALIGN_CENTER, new Phrase(watermarkText, font), 300, 400, 45);
document.Close();
}
public void AddTextWatermark(string sourceFilePath, string watermarkTemplatePath, string targetFilePath)
{
var pdfReaderSource = new PdfReader(sourceFilePath);
var pdfStamper = new PdfStamper(pdfReaderSource, new FileStream(targetFilePath, FileMode.Create));
var pdfReaderTemplate = new PdfReader(watermarkTemplatePath);
var page = pdfStamper.GetImportedPage(pdfReaderTemplate, 1);
for (var i = 0; i < pdfReaderSource.NumberOfPages; i++)
{
var content = pdfStamper.GetUnderContent(i + 1);
content.AddTemplate(page, 0, 0);
}
pdfStamper.Close();
pdfReaderTemplate.Close();
}