(recommended)
: It contains documentation for all objects (Worksheets, Ranges, Workbooks), properties, and events within the Excel object model, enabling automation via languages like VBA, C#, or VB.NET. microsoft office excel 12.0 object library download
Once Office (either 2007 for 12.0, or a newer version for a higher number) is installed, here is how you reference it in your code environment. (recommended) : It contains documentation for all objects
using Excel = Microsoft.Office.Interop.Excel; enabling automation via languages like VBA