This project is the .NET version of POI Java project at http://poi.apache.org/. POI is an open source project which can help you read/write xls, doc, ppt files. It has a wide application. For example, you can use it to generate a Excel report without Microsoft Office suite installed on your server and more efficient than call Microsoft Excel ActiveX at background; you can also use it to extract text from Office documents to help you implement full-text indexing feature (most of time this feature is used to create search engines).

Professional Service
NPOI team provides commercial consulting service(non-free) for you. We can provide customized development, urgent bug fix, 1:1 consulting (online), Q&A for anything related to NPOI. For detail price, please contact Tony Qu via tonyqus (at) gmail.com.

Why choose NPOI
Creating Excel spreadsheets .XLS and .XLSX in C# by Leniel Macaferi Great thanks to Leniel Macaferi for giving us a good case of why choose NPOI.
在 Server 端存取 Excel 檔案的利器：NPOI Library(Traditional Chinese) NPOI is introduced on MSDN of Microsoft Taiwan

NPOI 1.2.4 (Chinese)新教程地址：http://tonyqus.sinaapp.com

Donate NPOI
支付宝捐款：http://me.alipay.com/tonyqus

NPOI on SNS
QQ群: 124527967, 116053476, 189925337
Twitter: http://twitter.com/tonyqus
新浪微博: http://t.sina.com.cn/npoi

System Requirement
VS2005 or VS2008 with .NET 2.0 runtime (SP1)
VS2010 with .NET 4.0 runtime
vs2003 with .NET 1.1
medium trust environment in ASP.NET

Futures
We are working on OOXML support for NPOI. The first release including OOXML support will be NPOI 2.0