I am writing a account program, which in my design, I select various company client in a listbox, program switch to various directory and manipulate the datas.

For the databases design,
I put the program files at c:\account\file\
I put the databases under a directory : c:\account\data\
under the above directory,
I put data for A company at c:\account\data\acompany\
and for B company at c:\account\data\bcompany and so on.....

However, at design time, the form designer set the data environment say c:\account\data\master\account.dbc
How to program so that I can alter the data environment runtimely, and does it possible?