{

                    Type tyml = Type.GetType(lc_cdml);

                    object obj;

                    obj = Activator.CreateInstance(tyml);

                    Form form = (Form)obj;

                    form.ShowDialog();                                

                }

                catch (System.Exception e1)

                {

                    MessageBox.Show("输入的菜单项执行命令错误,请修改 ! " +

e1.Message, "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

                }

            }

            if (Menu.MenuItems[x1].Text == menucdml.Text)        

            {

               this.Close();

            }

}

4.5  operation 类代码

   创建大于10的序号与英文字母对照临时表：

        public void CdbmkzTable()       

        {