Dependent drop down list usin asp and database

I want to have three level dependent drop down lists:
Meaning:
User chooses an option in dropdown 1.
this lead to dropdown 2 getting populated as per options avalable related
to the choice made in dropdown 1.
similarly when the user chooses some option in dropdown 2 the dropdown 3
gets populated with options related to the choice made in dropdown 2.
The options for all the three drop down lists are available in MS Access
database.
Till the user selects any option in dropdown 1, the other two drop down
remain unfilled and blank.

Please advise on how to achieve it and is there any sample code available to
achieve the above.

UANDME72