C#控制CheckedListBox选中的项目数量

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        private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            if (e.CurrentValue == CheckState.Unchecked)
            {
                int count = getCheckedItemsCount();
                if (count == 5)
                {
                    MessageBox.Show("每次最多只能选择5个", "提示");
                    e.NewValue = CheckState.Unchecked;
                }
                else
                {
                    dbList.Add(this.checkedListBox1.Items[e.Index].ToString());
                }
            }
            else
            {
                dbList.Remove(this.checkedListBox1.Items[e.Index].ToString());
            }
        }
        private int getCheckedItemsCount()
        {
            int count = 0;
            for (int index = 0; index < this.checkedListBox1.Items.Count; index++)
            {
                if (this.checkedListBox1.GetItemCheckState(index) == CheckState.Checked)
                {
                    count += 1;
                }
            }
            return count;
        }