private void checkedList_ItemCheck(object sender, System.Windows.Forms.ItemCheckEventArgs e) 
{ 

}

 

private void checkedList_ItemCheck(object sender, System.Windows.Forms.ItemCheckEventArgs e) 
{ 
    if( e.NewValue == CheckState.Checked) 
    { 
    selectedList.Items.Add(checkedList.SelectedItem.ToString()); 
    } 
    else 
    { 
    selectedList.Items.Remove(checkedList.SelectedItem.ToString()); 
    } 
}