public sealed class PresentationWatermarkSlideOptions : PresentationWatermarkBaseSlideOptions

Public NotInheritable Class PresentationWatermarkSlideOptions
	Inherits PresentationWatermarkBaseSlideOptions

public ref class PresentationWatermarkSlideOptions sealed : public PresentationWatermarkBaseSlideOptions

[<SealedAttribute>]
type PresentationWatermarkSlideOptions =  
    class
        inherit PresentationWatermarkBaseSlideOptions
    end

PresentationLoadOptions loadOptions = new PresentationLoadOptions();
using (Watermarker watermarker = new Watermarker(@"C:\Documents\test.ppt", loadOptions))
{
    TextWatermark watermark = new TextWatermark("Test watermark", new Font("Arial", 36, FontStyle.Bold | FontStyle.Italic));
    watermark.HorizontalAlignment = HorizontalAlignment.Center;
    watermark.VerticalAlignment = VerticalAlignment.Center;

    PresentationWatermarkSlideOptions options = new PresentationWatermarkSlideOptions();
    options.SlideIndex = 0;
    options.IsLocked = false; // default
    options.ProtectWithUnreadableCharacters = false; // default
    options.Name = null; // default
    options.AlternativeText = null; // default

    watermarker.Add(watermark, options);
    watermarker.Save();
}