static void Main(string[] args)
{
Document doc = new Document("../../data/document.doc");
string watermarkText = "Aspose.Words for .NET";

// Create a watermark shape. This will be a WordArt shape.
// You are free to try other shape types as watermarks.
Shape watermark = new Shape(doc, ShapeType.TextPlainText);

// Set up the text of the watermark.
watermark.TextPath.Text = watermarkText;
watermark.TextPath.FontFamily = "Arial";
watermark.Width = 500;
watermark.Height = 100;

// Text will be directed from the bottom-left to the top-right corner.
watermark.Rotation = -40;

// Remove the following two lines if you need a solid black text.
watermark.Fill.Color = System.Drawing.Color.Gray;
// Try LightGray to get more Word-style watermark
watermark.StrokeColor = System.Drawing.Color.Gray;
// Try LightGray to get more Word-style watermark
// Place the watermark in the page center.
watermark.RelativeHorizontalPosition = RelativeHorizontalPosition.Page;
watermark.RelativeVerticalPosition = RelativeVerticalPosition.Page;
watermark.WrapType = WrapType.None;
watermark.VerticalAlignment = VerticalAlignment.Center;
watermark.HorizontalAlignment = HorizontalAlignment.Center;

// Create a new paragraph and append the watermark to this paragraph.
Paragraph watermarkPara = new Paragraph(doc);
watermarkPara.AppendChild(watermark);

// Insert the watermark into all headers of each document section.
foreach (Section sect in doc.Sections)
{
// There could be up to three different headers in each section, since we want
// the watermark to appear on all pages, insert into all headers.
insertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderPrimary);
insertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderFirst);
insertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderEven);
}
doc.Save("waterMarks.doc");
}
static void insertWatermarkIntoHeader(Paragraph watermarkPara, Section sect, HeaderFooterType headerType)
{
HeaderFooter header = sect.HeadersFooters[headerType];
if (header == null)
{
// There is no header of the specified type in the current section, create it.
header = new HeaderFooter(sect.Document, headerType);
sect.HeadersFooters.Add(header);
}

// Insert a clone of the watermark into the header.
header.AppendChild(watermarkPara.Clone(true));
}

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