Add Watermark Annotation to Document

Introduction

In this tutorial, we’ll walk through the process of adding a watermark annotation to a document using GroupDocs.Annotation for .NET. Watermark annotations are useful for indicating the status of a document, marking it as confidential, or adding any other relevant information.

Prerequisites

Before we begin, make sure you have the following:

1. GroupDocs.Annotation for .NET: You can download it from here.
2. Visual Studio: Ensure you have Visual Studio installed on your system.
3. Basic Knowledge of C#: Familiarity with C# programming language is necessary to understand and implement the code examples.

Import Namespaces

Before we start coding, let’s import the necessary namespaces:

using System;
using System.Collections.Generic;
using System.IO;
using GroupDocs.Annotation.Models;
using GroupDocs.Annotation.Models.AnnotationModels;

Now, let’s break down the process of adding a watermark annotation into multiple steps:

Step 1: Define Output Path

First, we need to define the output path where the annotated document will be saved. We’ll use the Path class from System.IO namespace to combine the output directory path with the filename.

string outputPath = Path.Combine("Your Document Directory", "result" + Path.GetExtension("input.pdf"));

Step 2: Initialize Annotator

Next, we’ll initialize the annotator by providing the input document’s path. This will allow us to add annotations to the document.

using (Annotator annotator = new Annotator("input.pdf"))
{
    // Annotation code will go here
}

Step 3: Create Watermark Annotation

Now, let’s create a watermark annotation object with the desired properties such as angle, position, text, font color, opacity, etc.

WatermarkAnnotation watermark = new WatermarkAnnotation
{
    Angle = 75,
    Box = new Rectangle(200, 200, 100, 50),
    CreatedOn = DateTime.Now,
    Text = "Watermark",
    FontColor = 65535,
    FontSize = 12,
    Message = "This is watermark annotation",
    Opacity = 0.7,
    PageNumber = 0,
    AutoScale = true,
    HorizontalAlignment = HorizontalAlignment.Center,
    VerticalAlignment = VerticalAlignment.Center,
    Replies = new List<Reply>
    {
        new Reply
        {
            Comment = "First comment",
            RepliedOn = DateTime.Now
        },
        new Reply
        {
            Comment = "Second comment",
            RepliedOn = DateTime.Now
        }
    }
};

Step 4: Add Watermark Annotation

Now, we’ll add the watermark annotation to the document using the Add method of the annotator object.

annotator.Add(watermark);

Step 5: Save Document

Finally, we’ll save the annotated document to the specified output path.

annotator.Save(outputPath);

Conclusion

In this tutorial, we learned how to add a watermark annotation to a document using GroupDocs.Annotation for .NET. Watermark annotations are a valuable tool for marking documents with relevant information or indicating their status.

FAQ’s

Q: Can I customize the appearance of the watermark annotation?

A: Yes, you can customize various properties such as text, font size, color, opacity, position, etc., to tailor the watermark according to your requirements.

Q: Is GroupDocs.Annotation for .NET compatible with different document formats?

A: Yes, GroupDocs.Annotation supports a wide range of document formats including PDF, Microsoft Word, Excel, PowerPoint, and image formats.

Q: Can I add multiple annotations to a single document?

A: Absolutely, GroupDocs.Annotation allows you to add multiple annotations of different types to a single document, enabling comprehensive document markup.

Q: Does GroupDocs.Annotation provide support for collaborative annotation?

A: Yes, GroupDocs.Annotation facilitates collaborative annotation by allowing users to add comments, replies, and annotations, fostering effective collaboration among team members.

Q: Is there a trial version available for GroupDocs.Annotation for .NET?

A: Yes, you can download a free trial version from here.