Adding Text Watermark
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    Adding Text Watermark in C#
The GroupDocs.Watermark which is a part of Conholdate.Total for .NET allows you to add text watermarks on images or other documents.
Code snippet below demonstrates how to add text watermark to a document. If the document consists of multiple parts such as pages, worksheets, slides, frames etc, the watermark will be added to all of them.
Example
AdvancedUsage.AddingTextWatermarks.AddTextWatermark
For more details please visit this article.