//참조추가(COM)
Microsoft Excel 11.0 Object Library
Microsoft Office 11.0 Object Library

참조추가(.NET)
Microsoft.Office.Tools.Excel
Microsoft.VisualStudio.Tools.Applications.Runtime

 이렇게 해서 안된다면..... 

 다음 링크에서 Office Primary Interop Assemblies 을 설치하세요.
http://www.microsoft.com/downloads/details.aspx?FamilyId=3C9A983A-AC14-4125-8BA0-D36D67E0F4AD&displaylang=en

그럼 된다!!

Posted by 아르다