I found a similar solution to this question in c# How to Select all the cells in a worksheet in Excel.Range object of c#?
What is the process to do this in VBA?
Another way to select all cells within a range, as long as the data is contiguous, is to use Range("A1", Range("A1").End(xlDown).End(xlToRight)).Select.
Range("A1", Range("A1").End(xlDown).End(xlToRight)).Select