ARCed.Database.Classes.ClassMainForm.CheckGroupArmorOnCheckChange C# (CSharp) Method

        private void CheckGroupArmorOnCheckChange(object sender, ItemCheckEventArgs e)
        {
            int id = e.Index + 1;
            if (e.NewValue == CheckState.Checked && !this._class.armor_set.Contains(id))
                this._class.armor_set.Add(id);
            else if (e.NewValue == CheckState.Unchecked && this._class.armor_set.Contains(id))
                this._class.armor_set.Remove(id);
        }