using GroupDocs.Watermark; using GroupDocs.Watermark.Search.SearchCriteria; using GroupDocs.Watermark.Search; namespace UpdateWatermarkTextinDOCXUsingCSharp { internal class Program { static void Main(string[] args) { // Set License to avoid the limitations of Watermark library License lic = new License(); lic.SetLicense(@"GroupDocs.Watermark.lic"); using (Watermarker watermarker = new Watermarker("input.docx")) { // Search watermark matching a particular text TextSearchCriteria searchCriteria = new TextSearchCriteria("Watermark Text", false); PossibleWatermarkCollection possibleWatermarks = watermarker.Search(searchCriteria); Console.WriteLine("Found {0} possible watermark(s).", possibleWatermarks.Count); foreach (PossibleWatermark watermark in possibleWatermarks) { // Update text watermark.Text = "Modified Watermark Text"; } // Save document watermarker.Save("output.docx"); } } } }