DataGridViewAutoFilter.MultiSelectHeaderList.cmdInvert_Click C# (CSharp) Метод

        private void cmdInvert_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < FilterListBox.Items.Count; i++)
            {
                FilterListBox.SetItemChecked(i, !FilterListBox.GetItemChecked(i));
            }
        }