a Excel

http://poi.apache.org/

http://www.leniel.net/2009/07/creating-excel-spreadsheets-xls-xlsx-c.html

http://npoi.codeplex.com/

http://www.codeplex.com/Wiki/View.aspx?ProjectName=ExcelPackage

http://www.aaron-powell.com/blog/september-2008/linq-to-xml-to-excel.aspx

http://www.leniel.net/2009/07/creating-excel-spreadsheets-xls-xlsx-c.html

http://www.carlosag.net/Tools/ExcelXmlWriter/