How to read Excel worksheets into datatables

Question

I'm trying to solve this problem that I have in my application.

I'm doing a add-in excel for excel, and I've never done it before.

What I need to to do is open an excel file in excel and then I need to use Globals.ThisAddIn.Application.ActiveWorkbook to access the workbook and retrieve the data from 4 worksheets into a datatable.

No connections with constrings, I have to work directly with the open book.
I've been working on this and getting nowhere.
Any help or pointers would be appreciated.

Answer 1

I managed to solve it on my own, which is great.