I am having troubles adding the excel reference to my project. I have already installed Primary Interop Assemblies.
The project is detecting the Microsoft.Office.Interop
As described in http://social.msdn.microsoft.com/Forums/vstudio/en-US/c9e83756-4ae2-4ed4-b154-1537f3bb3a22/cant-find-microsoftofficeinteropexceldll?forum=netfxsetup
On the Project menu, click "Add Reference."
On the COM tab, click Microsoft Excel Object Library, and then click Select. In Visual Studio 2012, locate Microsoft Excel 14.0 (or other version) Object Library on the COM tab.
Click OK in the Add References dialog box to accept your selections. If you are prompted to generate wrappers for the libraries that you selected, click “Yes”.