Using MS Visual Studio 2005, I created an Excel-related solution in 2006. With MS Visual Studio 2012, I can no longer utilize the same reference.
var app = new Microsoft.Office.Interop.Excel.Application();
Workbooks wbs = app.Workbooks;
Use NuGet (VS 2013+):
The NuGet package manager is the simplest method in any modern version of Visual Studio. (Even VS2013, with the NuGet Package Manager for Visual Studio 2013 extension.)
Right-click on "References" and choose "Manage NuGet Packages...", then just search for Excel.
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