title: How to call selectedindexchange event from buttonclick event?
body: <p>I have created one form.In that form base on first dropdownlist's item,second get populated.first dropdownlist contain class,onselection of class,appropriate subject name(only 1) get populated.This is working properly.Onbutton click event of update button,I am fetching value from database and assigning to control.First dropdownlist is filled at page load.But my second dropdownlist get filled only after firstdropdownlist's item selection.I am assigning year to first dropdownlist.But when I am trying to assign a subjectname to second,it is already empty.How to call selectedindexchange of firstdownlist in update button click event.</p>