One of the easiest ways of exporting and importing databases is to create a flat file, also known as a CSV. This is basically a database dump formatted as a delimited text file which then can be imported into pretty much any database.

The result you want (creating a .dbf file) via an ASP scrip is a lot more complicated and cumbersome, you would pretty much need to write an application that will generate a binary file containing structure and data in dBaseIII standard. I don't know of any, but perhaps some one might point you to a good export utility, I doubt it would be written in ASP though.