I have a usercontrol that has five listboxes listA,listB,listC,listD,listE. listA gives an option to the users to select one of several or multiple values from the its list. listB,listC,listD,listE are populated by a click event on a text heading sitting on top of listB. I want the values inside listB,listC,listD,listE to change based on selection inside the listA box and not because of a click event. So i want to know how can i fire the listA_SelectIndexChanged event of the usercontrol from the page where i am using this control?