Writing and Executing VBA Macros on Excel without using Excel.Interop [duplicate]

Answer 1

1. Open Excel
2. Press Alt+F11

You will now be in the VBA IDE.

To run something on Auto Open:

1. Select ThisWorkbook From the VBAProject in Project Explorer on the Left of your screen

2. There are Two drop downs near the top of the window one will say (General) and The other (Declarations) click on (General) and select workbook

Excel should automatically bring you to the Open declaration.

Anything written in this sub will execute on open.