转换成CSV文件:
http://www.dotnetgallery.com/lab/resource93-Export-to-CSV-file-from-Data-Table-in-Aspnet.aspx
http://www.devasp.net/net/articles/display/1330.html
http://stackoverflow.com/questions/16582993/how-to-save-a-datatable-as-a-csv-file-on-client-pc-asp-net
http://www.aspsnippets.com/Articles/Export-DataSet-or-DataTable-to-Word-Excel-PDF-and-CSV-Formats.aspx
读取CSV文件:
http://www.dotnetfox.com/articles/parse-or-read-csv-file-using-textfieldparser-in-Asp-Net-1112.aspx