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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 word art
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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