how to code in visual basic where i want the user click the certain button that allow user to save the whole database information to specific extension that i have filter. and then, doing one application or program only can read or open that specific file that contain that particular database information

* the database call mydata.mdb, there consist two or mores.let assume that only consist two table call Lecturer and Student. then, i ask user to click one button call btSave. the whole database will save to specific path by typing the file name. but the filter extension was fixed to *.mml . after that, system will ask user to click one button to read or retrieve all the information contain in that database. let said is abc.mml. that application must successful to retrieve the information that contain in these both tables and show up in the form.

the method using this is use CommandDialog

thanks.........