var hssfWorkbook = new HSSFWorkbook();

            var sheet = hssfWorkbook.CreateSheet();

            var patr =  sheet.CreateDrawingPatriarch();

            var comment1 = patr.CreateCellComment(new HSSFClientAnchor(, , , , , , , ));

            comment1.String = new HSSFRichTextString("Hello World");

            comment1.Author = "NPOI Team";

            comment1.Visible = true;//对于批注，一种是隐藏（默认），一种是显示（即表单一打开就显示该批注）

            var cell = sheet.CreateRow().CreateCell();

            cell.CellComment = comment1;

            var fs = new FileStream("创建批注.xls", FileMode.Create);

            hssfWorkbook.Write(fs);

            fs.Close();