namespace System.Windows.Forms
{
    public class ItemCheckEventArgs : EventArgs
    {
        public int Index { get; }

        public CheckState NewValue { get; set; }

        public CheckState CurrentValue { get; }

        public ItemCheckEventArgs(int index, CheckState newCheckValue, CheckState currentValue)
        {
            Index = index;
            NewValue = newCheckValue;
            CurrentValue = currentValue;
        }
    }

    public delegate void ItemCheckEventHandler(object sender, ItemCheckEventArgs e);

}