put mdb file list in dropdownlist from a folder

I have some mdb file in a folder. I want to populate  dropdown with mdb filename from a folder. 

Then on button click I have to read mdb file and store data into table.

 my mdb file i have 2 worksheet . so i have another dropdown containing item i.e approved  and disapproved.

on selection of approved option from 1st dropdown.. ....  2nd dropdown should  populate with name of 1st worksheet of mdb file and

selection of disapproved option from 1st dropdown.. ....  2nd dropdown should  populate with name of 2st worksheet of mdb file.

and after that reading of mdb file on button click.

so how to do it. masters. kindly suggest .