为COMBOBOX绑定固定数据源（含VALUE值）

        private void frmConfirmInvoice_Load(object sender, EventArgs e)
        {
            ArrayList list = new ArrayList();
            list.Add(new DictionaryEntry("A", "1"));
            list.Add(new DictionaryEntry("B", "2"));
            list.Add(new DictionaryEntry("C", "3"));
            cmbClass.DataSource = list;
            cmbClass.DisplayMember = "Key";
            cmbClass.ValueMember = "Value";
        }