Autocompleteextender control in asp.net

Question

i am using asp.net with c#....I am using two textbox and two Autocompleteextender control in asp.net....the first one control  is used to retrieve database value from sqlserver database..the data is (example--city)..the second control is retrieve the data from the same table..the data is (example--name)..
i want to display the name only based on the city.....who one name are matching with city that names are only display in the second textbox using autocompleteextender control...