Add Comment with rich text contents

Output: CommentsRichText.xlsx

public void Run()
{
    var workbook = new Workbook();
    var worksheet = workbook.Worksheets[0];

    worksheet.GetRange("A1:A10").SetRowsHeight(60);
    worksheet.Columns["A"].WidthPixels = 100;
    worksheet.Columns["B"].WidthPixels = 100;

    var richText = new RichTextParagraph();
    richText.Runs.Add(new RichTextRun(){FontName = "Arial",FontSize = 10,Foreground =             SpreadsheetColor.Red,Text = "Arial 10 Red"});
    richText.Runs.Add(new RichTextRun() { FontName = "Cambria", FontSize = 6, Foreground = SpreadsheetColor.Green, Text = "Cambria 6 Green" });
    worksheet["A2"].AddComment("DR-IT", richText);
    this.FormatComment(worksheet, "A2");


    workbook.SaveAs("CommentsRichText.xlsx");
}

private void FormatComment(Worksheet worksheet,string label)
{
    worksheet[label].Comment.Size.WidthPixels = 80;
    worksheet[label].Comment.Size.HeightPixels = 50;
    //Anchor the comment shape one row above and one column to the left
    worksheet[label].Comment.AnchoredCell = worksheet[worksheet[label].Row.Index - 1, worksheet[label].Column.Index + 1];
    //Always show the comment
    worksheet[label].Comment.Visible = true;
}