public class TextWatermark : Watermark

Public Class TextWatermark
	Inherits Watermark

public ref class TextWatermark : public Watermark

type TextWatermark =  
    class
        inherit Watermark
    end

foreach (string file in Directory.GetFiles("C:\\test"))
{
    using (Watermarker watermarker = new Watermarker(file))
    {
        TextWatermark watermark = new TextWatermark("test watermark", new Font("Arial", 36));
        watermark.HorizontalAlignment = HorizontalAlignment.Center;
        watermark.VerticalAlignment = VerticalAlignment.Center;
        watermark.SizingType = SizingType.ScaleToParentDimensions;
        watermark.RotateAngle = 45;
        watermark.ScaleFactor = 0.4;

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