Hi Ashish,
Thanks for your interest in our products.
In order to fulfill your requirements, you may consider adding TextStamp to pages of existing PDF file. Please try using the following code snippet to accomplish your requirement.
[C#]
//open document<o:p></o:p>
PdfFileStamp fileStamp = new PdfFileStamp();
fileStamp.BindPdf("c:/pdftest/test_pdf.pdf");
//Instantiate a stamp object
Aspose.Pdf.Facades.Stamp
logoStamp = new Aspose.Pdf.Facades.Stamp();
logoStamp.Opacity = 0.5f;
logoStamp.SetOrigin(100, 100);
//Instantiate an object of
FormattedText class
FormattedText formatText = new FormattedText("Hello World!",System.Drawing.Color.FromArgb(180, 0, 0), Aspose.Pdf.Facades.FontStyle.TimesItalic, EncodingType.Winansi,
false, 50);
//Add another line for Stamp
formatText.AddNewLineText("Good
Luck");
//BindLogo to PDF
logoStamp.BindLogo(formatText);
//add stamp to PDF file
fileStamp.AddStamp(logoStamp);
// save stamped PDF file
fileStamp.Save(“c:/pdftest/MultiLineStamp.pdf”);
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