GrapeCity.Documents.Excel.IWorksheet.Comments

Comments Property

Gets the IComments collection that represents all the comments in the worksheet.

Use this property to access and enumerate cell comments in the current worksheet.

IComments Comments { get; }

ReadOnly Property Comments As IComments

worksheet.Range["B2"].AddComment("Review this value");
IComments comments = worksheet.Comments;
IComment comment = comments[0];