private void btnDeleteEvent_Click(object sender, EventArgs e) { //Close Attendee Panels If Open subEventViewer.hidePanelViewEditAttendeesPersonal(); subEventViewer.hidePanelViewEditAttendeesManager(); subEventViewer.hidePanelCheckAvailabilityAttendees(); subEventViewer.hideSubEventControlsAddEdit(); //Hide Add/Edit Buttons //USAGE ERROR CHECKING int selectedIndex = subEventViewer.checkedListBox1.CheckedItems.Count; if (selectedIndex == 0) { DialogResult Error = MessageBox.Show("No events are selected.", "Error", MessageBoxButtons.OK); return; } subEventViewer.hideSubEventControlsAddEdit(); subEventViewer.deleteSelectedEvents(sender); }