Add watermark text to Excel document - c#

I'm using OpenXML to generate Excel file.
I want to add watermark text to the Excel sheet using OpenXML.
How I can do this using OpenXML?

As word document watermark there is no such feature in Microsoft excel. But it can be mimic by applying Header, Footer or background image.
Please refer below link for adding background image in E
Add background image to Excel using OpenXML

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Read PowerPoint Notes Slides Headers Footers using OpenXML

I can read all texts in all slides in powerPoint file, but I can't read the NotesSlides in PPT using OpenXML.
I am trying to read the Headers and Footers of NotesSlide. Not the Slides.
Anyone can help?
enter image description here

How to do complete border on excel using OpenXml in C#?

Excel document demo
I want to make a complete border on Excel using OpenXml. Able to a particular column but not able to do the complete. Please review.

Save colored text from RichTextBox to pdf [duplicate]

Using iTextSharp (and c#/ASP.NET) is it possible to open an RTF document, manipulate it by replacing some text, insert an image (WMF or PNG), and the export that manipulated document to a PDF document that retains the formatting of the original RTF document?
Essentially I'm hoping to create a simple mail merge solution with the template being in RTF and the output needing to be in PDF. This needs to run on an ASP.NET server.
No it is not possible per se with iTextSharp. Better approach will be to use Word Object to open document, do mailmerge and then save those documents ad HTML. Now you can use iTextSharp to parse html and create PDF.

Exporting Gridview to PDF using ITextSharp with formatting

I am trying to export a beautifully designed gridview to pdf using itextsharp. The export works fine, but it only export the content of the cells. No Lines to show its a table, no background colour etc. Please How do i export such that it carries gridview as viewed in C#

C# - How to: Open PDF, highlight search-results, and save highlighting back to PDF

I'm using itextsharp.dll.
How do I search and highlight text in the pdf file?
After highlighting the text in pdf, I want to save the highlighted pdf file such that when the PDF is re-opened, it is still highlighted.
Any ideas?
Have you consider another library such as Apache PDFBox? It is support following features:
PDF to text extraction
Merge PDF Documents
PDF Document
Encryption/Decryption
Lucene Search Engine Integration
Fill in form data FDF and XFDF
Create a PDF from a text file
Create images from PDF pages Print a PDF

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