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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (Document doc = Document.Load(Utilities.MapSourceFilePath (PngFilePath)))
{
    // Initialize the font to be used for watermark
    Font font = new Font("Arial", 19, FontStyle.Bold | FontStyle.Italic);

    TextWatermark watermark = new TextWatermark("Test watermark", font);

    // Set watermark properties
    watermark.ForegroundColor = Color.Red;
    watermark.BackgroundColor = Color.Blue;
    watermark.TextAlignment = TextAlignment.Right;
    watermark.Opacity = 0.5;

    doc.AddWatermark(watermark);

    doc.Save();
}