Assign Data to DropDownList with CascadingDropDown extender

I have DropDownList with CascadingDropDown extender.

If I want to retrieve data from the database for update to what I sh开发者_开发问答ould assign the data...... to the dropdownlist or to CascadingDropDown extender and to what properties exactly I should use?

please advice!!

If you're referring to initial data for the control, then you can databind or add list items as you normally would with a DropDownList. If you're referring to what happens when a user selects a value in one of the lists, this is handled client-side and the data should be returned by a web service method. You can find the information here under the "CascadingDropDown Properties" heading.