如何把CheckedlistBox控件中未选项从控件中移除?

见题目,注意是移除喔,不是把选择状态改为非选状态
我这样却不行呢
//移除未选项
            foreach (int i in checkedListBox1.CheckedIndices)
            {
                if (checkedListBox1.GetItemCheckState(i) ==CheckState.Checked)
                    //checkedListBox1.SetItemCheckState(i, CheckState.Unchecked);
                    checkedListBox1.Items.RemoveAt(i);

            }