dropdown 1 selection populates dropdown 2?

[eluser]w1n78[/eluser]
i have 2 drop down menus. the first drop down is a list of districts. the second are schools. if a district is selected, i'd like the schools that belong to that district populate the 2nd drop down. here's how my db looks like

district table
district_id
district_name


school table
school_id
school_name
district_id

so the relationship is district.district_id = school.district_id. before MVC i used jquery and passed the IDs through the querystring and used $(.get). i know how to set up the models but how do i get the controller to work? i'd like this to be in one form on one page.