WebDropDown1.ClientEvents.DropDownClosing = "WebDropDown_DropDownClosing"
WebDropDown1.ClientEvents.DropDownClosing = "WebDropDown_DropDownClosing";
// The client event 'DropDownClosing' takes two parameters sender and e // sender is the object which is raising the event // e is the DropDownContainerEventArgs function WebDropDown_DropDownClosing(sender, e) { if (!confirm("Are you sure you want to close the drop-down container?")) //Cancels the DropDownClosing event e.set_cancel(true); }