Iterating BufferedDataTable on rows and column


I have a question regarding BufferedDataTable.

I'm trying to iterate over a buffereddatatable on rows and columns so that I can go through every cell in excel file and compare the whole numbers in excel file with another number.

I see that BufferedDataTable takes an iterable DataRow, but column.

How do I scan the whole cells in an excel file so it will go through every cell in every row and column?

Thank you very much.