<p>I wanna use npoi to manipulate <code>.xlsx</code> files in <code>VS2012/2010</code>. To do so I should import <code>NPOI.XSSF.UserModel</code>, but when I add the <code>npoi.dll</code> and try to import that, there is no <code>XSSF</code> type of <code>NPOI</code> at Using part. I mean that there is no "<code>Using NPOI.XSSF</code>" Any help?</p>

<p>You need to include <code>NPOI.OOXML.dll</code> dll to use <code>NPOI.XSSF.UserModel</code> namespace</p>

can not found npoi.xssf.usermodel

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I wanna use npoi to manipulate .xlsx files in VS2012/2010. To do so I should import NPOI.XSSF.UserModel, but when I add the npoi.dll and try to import that, there is no XSSF type of NPOI at Using part. I mean that there is no "Using NPOI.XSSF" Any help?