Creation of Worksheet object fails the program about excellibrary HOT 2 OPEN

Please provide us more details or post some sample code that causes issue. 

I am not sure about Sameer's question from 2009, but when I paste the sample 
code from one ExcelLibrary website into the Main function for a Console App, C# 
complains about almost everything in the file. For a start, C# (VS 2010) 
complains about the following statement in the sample code:

" Workbook workbook = new Workbook();"

And here is the error message:
"Cannot create an instance of the abstract class or interface 
'Microsoft.Office.Tools.Excel.Workbook".

I understand interfaces, so the question is, what was intended in the sample 
code?

Thus, I cannot even move on to the complaints about Interop, which is not one 
of the references for the project, and which this code does not "use".