Drop Down Lists Filtering - dependant on each other

I have three drop down boxes: Name, Department, Date Hired.
What the client would like is when you pick a Name from that drop down, the other two boxes repopulate with information specific to that name only. This would also apply to the Name box if a department were selected, showing only names in that department, as well as the dates hired applying to those names.
Right now I have labels storing the SelectedValue of the drop downs. The on-page datasources then pull those labels, to ensure I don't have a drop down binding too soon and missing the SelectedValue of a drop down it's dependant on.
Is there a better way to handle this?