Using GroupDocs.Watermark, you can add watermark to all pages of a particular type in a document. It consists of following steps....TextWatermark ( "Test watermark 1" , new Font ( "Calibri" , 19 )); DiagramShapeWatermar...TextWatermark ( "Test watermark 1" , new Font ( "Calibri" , 19 )); DiagramShapeWatermar...