The CascadingDropDown control in the AJAX Control Toolkit extends a DropDownList control so that changes in one DropDownList loads associated values in another DropDownList. (For instance, one list provides a list of US states, and the next list is then filled with major cities in that state.) With a little bit of code it is possible that a list element is preselected once the data has been dynamically loaded.
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submitted 216 days ago