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The following example shows how to add a WordArt shape to set a background watermark for a worksheet.
After running the code, the output file contains a pale red WordArt watermark.
The output file

C#
string FilePath = @"..\..\..\Sample Files\";
string FileName = FilePath + "Add WordArt Watermark to Worksheet.xlsx";
// Instantiate a new Workbook
Workbook workbook = new Workbook();
// Get the first default sheet
Worksheet sheet = workbook.Worksheets[0];
// Add Watermark
Aspose.Cells.Drawing.Shape wordart = sheet.Shapes.AddTextEffect(
MsoPresetTextEffect.TextEffect1,
"CONFIDENTIAL",
"Arial Black",
50,
false,
true,
18,
8,
1,
1,
130,
800);
// Get the fill format of the WordArt
MsoFillFormat wordArtFormat = wordart.FillFormat;
// Set the color
wordArtFormat.ForeColor = System.Drawing.Color.Red;
// Set the transparency
wordArtFormat.Transparency = 0.9;
// Make the line invisible
MsoLineFormat lineFormat = wordart.LineFormat;
lineFormat.IsVisible = false;
// Save the file
workbook.Save(FileName);
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