How to add comments in Excel file through C#

See more:

C#

.NET

SQL-Server

, +

I m writing this code for creating excel file.this is working fine, but i also need to add comments in excel file for duplicate rows.
What can i do for that ? pls help !!

DataSet dsreport = new DataSet();
 dsreport.Tables.Add(dtDuplicateRecord); 
ExcelExport xObj = new ExcelExport(sFileName);
 xObj.PopulateFromDataSet(dsreport); 
xObj.SaveToFile();