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Merge pull request #2023 from Syncfusion-Content/hotfix/hotfix-v25.1.35
DOCINFRA-2341_merged_using_automation
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‎File-Formats/PDF/Working-with-DigitalSignature.md‎

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{% endtabs %}
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## Troubleshooting
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<th style="font-size:14px"><b>Signature is not visible after signing the document.
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</b></th>
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<table>
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<tr>
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<th style="font-size:14px">Reason
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</th>
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<td style="font-size:14px">
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<b>The signature bounds is not properly set, due to this may appear invisible.</b>
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</td>
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</tr>
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<tr>
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<th style="font-size:14px"> Solution
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</th>
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<td>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
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{% tabs %}
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{% highlight c# tabtitle="C#" %}
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//Set the signature bounds.
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signature.Bounds= new RectangleF(new PointF(0, 0), new SizeF(100, 100));
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{% endhighlight %}
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{% endtabs %}
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</td>
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</tr>
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</table>
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‎File-Formats/PDF/Working-with-Tagged-PDF.md‎

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## Marking PDF content as an artifact
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Artifacts in the PDF document can be graphic objects or other markings that are not a part of the authored content and will include such things as: headers, footers, page numbers, watermarks, cut marks, color bars, background images, lines separating content, or decorative images.
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You can add artifact tag to PDF element by using the [PdfArtifact](https://help.syncfusion.com/cr/file-formats/Syncfusion.Pdf.PdfArtifact.html) class. The artifact type can be speified by using the [ArtifactType](https://help.syncfusion.com/cr/file-formats/Syncfusion.Pdf.PdfArtifact.html#Syncfusion_Pdf_PdfArtifact_ArtifactType) property available in the ```PdfArtifact``` class.
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You can add artifact tag to PDF element by using the [PdfArtifact](https://help.syncfusion.com/cr/file-formats/Syncfusion.Pdf.PdfArtifact.html) class. The artifact type can be specified by using the [ArtifactType](https://help.syncfusion.com/cr/file-formats/Syncfusion.Pdf.PdfArtifact.html#Syncfusion_Pdf_PdfArtifact_ArtifactType) property available in the ```PdfArtifact``` class.
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The following code explains how to add tag for header and footers in the PDF document.
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‎File-Formats/PDF/Working-with-Watermarks.md‎

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The following screenshot shows the output of adding image watermark to an existing PDF document.
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<img src="Watermark_images/Watermark_img4.jpg" alt="Image watermark in an existing PDF" width="100%" Height="Auto"/>
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### Adding Watermark Annotation
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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.
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The following code example explains how to add a watermark annotation in the PDF document
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{% tabs %}
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{% highlight c# tabtitle="C# [Cross-platform]" %}
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//Load the PDF document
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FileStream docStream = new FileStream("input.pdf", FileMode.Open, FileAccess.Read);
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PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
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//Get the page
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PdfLoadedPage lpage = loadedDocument.Pages[0] as PdfLoadedPage;
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//Creates PDF watermark annotation
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PdfWatermarkAnnotation watermark = new PdfWatermarkAnnotation(new RectangleF(100, 100, 200, 50));
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//Sets properties to the annotation
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watermark.Opacity = 0.5f;
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//Create the appearance of watermark
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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));
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//Adds the annotation to page
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lpage.Annotations.Add(watermark);
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//Save the document into stream
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MemoryStream stream = new MemoryStream();
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loadedDocument.Save(stream);
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//Close the document
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loadedDocument.Close(true);
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{% endhighlight %}
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{% highlight c# tabtitle="C# [Windows-specific]" %}
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//Load the existing PDF document
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PdfLoadedDocument loadedDocument = new PdfLoadedDocument("input.pdf");
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//Get the page
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PdfLoadedPage lpage = loadedDocument.Pages[0] as PdfLoadedPage;
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//Creates PDF watermark annotation
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PdfWatermarkAnnotation watermark = new PdfWatermarkAnnotation(new RectangleF(100, 100, 200, 50));
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//Sets properties to the annotation
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watermark.Opacity = 0.5f;
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//Create the appearance of watermark
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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));
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//Adds the annotation to page
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lpage.Annotations.Add(watermark);
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//Saves the document to disk.
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loadedDocument.Save("WatermarkAnnotation.pdf");
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loadedDocument.Close(true);
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{% endhighlight %}
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{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
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'Load the existing PDF document
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Dim loadedDocument As New PdfLoadedDocument("input.pdf")
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'Get the page
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Dim lpage As PdfLoadedPage = TryCast(loadedDocument.Pages(0),PdfLoadedPage)
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'Creates PDF watermark annotation
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Dim watermark As New PdfWatermarkAnnotation(New RectangleF(100, 100, 200, 50))
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watermark.Opacity = 0.5f;
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'Creates the appearance of watermark
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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))
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'Adds annotation to the page
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lpage.Annotations.Add(watermark)
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'Saves the document to disk.
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loadedDocument.Save("WatermarkAnnotation.pdf")
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loadedDocument.Close(True)
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{% endhighlight %}
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{% endtabs %}
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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).
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### Removing Watermark Annotation
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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.
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{% tabs %}
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{% highlight c# tabtitle="C# [Cross-platform]" %}
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//Load the PDF document
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FileStream docStream = new FileStream("input.pdf", FileMode.Open, FileAccess.Read);
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PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
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// Iterate through the annotations collection and remove PdfLoadedWatermark annotations
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foreach (PdfPageBase page in loadedDocument.Pages)
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{
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for (int i = page.Annotations.Count - 1; i >= 0; i--)
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{
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// Check if the annotation is a PdfLoadedWatermarkAnnotation
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if (page.Annotations[i] is PdfLoadedWatermarkAnnotation)
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{
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// Remove the PdfLoadedWatermarkAnnotation
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page.Annotations.RemoveAt(i);
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}
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}
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}
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//Save the document into stream
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MemoryStream stream = new MemoryStream();
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loadedDocument.Save(stream);
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//Close the document
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loadedDocument.Close(true);
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{% endhighlight %}
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{% highlight c# tabtitle="C# [Windows-specific]" %}
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//Load the existing PDF document
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PdfLoadedDocument loadedDocument = new PdfLoadedDocument("input.pdf");
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// Iterate through the annotations collection and remove PdfLoadedWatermark annotations
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foreach (PdfPageBase page in loadedDocument.Pages)
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{
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for (int i = page.Annotations.Count - 1; i >= 0; i--)
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{
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// Check if the annotation is a PdfLoadedWatermarkAnnotation
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if (page.Annotations[i] is PdfLoadedWatermarkAnnotation)
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{
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// Remove the PdfLoadedWatermarkAnnotation
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page.Annotations.RemoveAt(i);
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}
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}
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}
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//Saves the document to disk.
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loadedDocument.Save("WatermarkAnnotation.pdf");
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loadedDocument.Close(true);
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{% endhighlight %}
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{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
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'Load the existing PDF document
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Dim loadedDocument As New PdfLoadedDocument("input.pdf")
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' Iterate through the annotations collection and remove PdfLoadedWatermark annotations
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For Each page As PdfPageBase In loadedDocument.Pages
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Dim i As Integer = page.Annotations.Count - 1
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While i >= 0
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' Check if the annotation is a PdfLoadedWatermarkAnnotation
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If TypeOf page.Annotations(i) Is PdfLoadedWatermarkAnnotation Then
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' Remove the PdfLoadedWatermarkAnnotation
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page.Annotations.RemoveAt(i)
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End If
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i -= 1
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End While
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Next
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'Saves the document to disk.
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loadedDocument.Save("WatermarkAnnotation.pdf")
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loadedDocument.Close(True)
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{% endhighlight %}
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{% endtabs %}
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You can download a complete working sample from [GitHub](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/Watermark/Removing-watermark-annotation-in-PDF-document).
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