regarding autofilling of Dropdownlist box

Hi,



I want add the functionality of web service to give whether forecast.



Following is the link for the webservice

http://www.webservicex.net/WS/WSDeta...TID=12&WSID=56

This web service has two webMethods



1.. GetCitiesByCountry


2.. GetWeather


GetCitiesByCountry returns all major cities by country name(full / part)



GetWeather returns weather report for all major cities around the world.





I want a interface when a user select the country from a drop down list, a
second dropdown list fill according to the cities of the selected country.



How can we do this , Please suggest.