| Reason + | ++The signature bounds is not properly set, due to this may appear invisible. + | +
|---|---|
| Solution + | +We recommend ensuring that the bounds value of the signature field is correctly set and drawing the image with the signature to ensure its visibility +{% tabs %} + +{% highlight c# tabtitle="C#" %} + +//Set the signature bounds. +signature.Bounds= new RectangleF(new PointF(0, 0), new SizeF(100, 100)); + +{% endhighlight %} +{% endtabs %} + | +
+
+
+### Adding Watermark Annotation
+
+A watermark annotation is used to represent graphics that are expected to be printed at a fixed size and position on a page, regardless of the dimensions of the printed page. [PdfWatermarkAnnotation](https://help.syncfusion.com/cr/file-formats/Syncfusion.Pdf.Interactive.PdfWatermarkAnnotation.html) can be used.
+The following code example explains how to add a watermark annotation in the PDF document
+
+{% tabs %}
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+
+//Load the PDF document
+FileStream docStream = new FileStream("input.pdf", FileMode.Open, FileAccess.Read);
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+//Get the page
+PdfLoadedPage lpage = loadedDocument.Pages[0] as PdfLoadedPage;
+
+//Creates PDF watermark annotation
+PdfWatermarkAnnotation watermark = new PdfWatermarkAnnotation(new RectangleF(100, 100, 200, 50));
+//Sets properties to the annotation
+watermark.Opacity = 0.5f;
+//Create the appearance of watermark
+watermark.Appearance.Normal.Graphics.DrawString("Watermark Text", new PdfStandardFont(PdfFontFamily.Helvetica, 20), PdfBrushes.Red, new RectangleF(0, 0, 200, 50), new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle));
+//Adds the annotation to page
+lpage.Annotations.Add(watermark);
+
+//Save the document into stream
+MemoryStream stream = new MemoryStream();
+loadedDocument.Save(stream);
+//Close the document
+loadedDocument.Close(true);
+
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+
+//Load the existing PDF document
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument("input.pdf");
+//Get the page
+PdfLoadedPage lpage = loadedDocument.Pages[0] as PdfLoadedPage;
+
+//Creates PDF watermark annotation
+PdfWatermarkAnnotation watermark = new PdfWatermarkAnnotation(new RectangleF(100, 100, 200, 50));
+//Sets properties to the annotation
+watermark.Opacity = 0.5f;
+//Create the appearance of watermark
+watermark.Appearance.Normal.Graphics.DrawString("Watermark Text", new PdfStandardFont(PdfFontFamily.Helvetica, 20), PdfBrushes.Red, new RectangleF(0, 0, 200, 50), new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle));
+//Adds the annotation to page
+lpage.Annotations.Add(watermark);
+
+//Saves the document to disk.
+loadedDocument.Save("WatermarkAnnotation.pdf");
+loadedDocument.Close(true);
+
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+
+'Load the existing PDF document
+ Dim loadedDocument As New PdfLoadedDocument("input.pdf")
+'Get the page
+Dim lpage As PdfLoadedPage = TryCast(loadedDocument.Pages(0),PdfLoadedPage)
+
+'Creates PDF watermark annotation
+Dim watermark As New PdfWatermarkAnnotation(New RectangleF(100, 100, 200, 50))
+watermark.Opacity = 0.5f;
+'Creates the appearance of watermark
+watermark.Appearance.Normal.Graphics.DrawString("Watermark Text", New PdfStandardFont(PdfFontFamily.Helvetica, 20), PdfBrushes.Red, New RectangleF(0, 0, 200, 50), New PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle))
+'Adds annotation to the page
+lpage.Annotations.Add(watermark)
+
+'Saves the document to disk.
+loadedDocument.Save("WatermarkAnnotation.pdf")
+loadedDocument.Close(True)
+
+{% endhighlight %}
+
+{% endtabs %}
+
+You can download a complete working sample from [GitHub](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/Annotation/Add-watermark-annotation-in-the-PDF-document).
+
+
+### Removing Watermark Annotation
+
+You can remove the Watermark annotation from the annotation collection, represented by the [PdfLoadedAnnotationCollection](https://help.syncfusion.com/cr/file-formats/Syncfusion.Pdf.Parsing.PdfLoadedAnnotationCollection.html) of the loaded page. The following code illustrates this.
+
+{% tabs %}
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+
+ //Load the PDF document
+ FileStream docStream = new FileStream("input.pdf", FileMode.Open, FileAccess.Read);
+ PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+ // Iterate through the annotations collection and remove PdfLoadedWatermark annotations
+ foreach (PdfPageBase page in loadedDocument.Pages)
+ {
+ for (int i = page.Annotations.Count - 1; i >= 0; i--)
+ {
+ // Check if the annotation is a PdfLoadedWatermarkAnnotation
+ if (page.Annotations[i] is PdfLoadedWatermarkAnnotation)
+ {
+ // Remove the PdfLoadedWatermarkAnnotation
+ page.Annotations.RemoveAt(i);
+ }
+ }
+ }
+
+ //Save the document into stream
+ MemoryStream stream = new MemoryStream();
+ loadedDocument.Save(stream);
+ //Close the document
+ loadedDocument.Close(true);
+
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+
+ //Load the existing PDF document
+ PdfLoadedDocument loadedDocument = new PdfLoadedDocument("input.pdf");
+ // Iterate through the annotations collection and remove PdfLoadedWatermark annotations
+ foreach (PdfPageBase page in loadedDocument.Pages)
+ {
+ for (int i = page.Annotations.Count - 1; i >= 0; i--)
+ {
+ // Check if the annotation is a PdfLoadedWatermarkAnnotation
+ if (page.Annotations[i] is PdfLoadedWatermarkAnnotation)
+ {
+ // Remove the PdfLoadedWatermarkAnnotation
+ page.Annotations.RemoveAt(i);
+ }
+ }
+ }
+
+ //Saves the document to disk.
+ loadedDocument.Save("WatermarkAnnotation.pdf");
+ loadedDocument.Close(true);
+
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+
+ 'Load the existing PDF document
+ Dim loadedDocument As New PdfLoadedDocument("input.pdf")
+ ' Iterate through the annotations collection and remove PdfLoadedWatermark annotations
+ For Each page As PdfPageBase In loadedDocument.Pages
+ Dim i As Integer = page.Annotations.Count - 1
+ While i >= 0
+ ' Check if the annotation is a PdfLoadedWatermarkAnnotation
+ If TypeOf page.Annotations(i) Is PdfLoadedWatermarkAnnotation Then
+ ' Remove the PdfLoadedWatermarkAnnotation
+ page.Annotations.RemoveAt(i)
+ End If
+ i -= 1
+ End While
+ Next
+
+ 'Saves the document to disk.
+ loadedDocument.Save("WatermarkAnnotation.pdf")
+ loadedDocument.Close(True)
+
+{% endhighlight %}
+
+{% endtabs %}
+
+You can download a complete working sample from [GitHub](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/Watermark/Removing-watermark-annotation-in-PDF-document).
+