private void button1_Click(object sender, EventArgs e)

        {

            RegistryKey rk = Registry.CurrentUser.CreateSubKey(@"Software\Microsoft\Internet Explorer\TypedURLs");

            string[] list = rk.GetValueNames();

            foreach (string s in list)

            {

                rk.DeleteValue(s);

            }

            MessageBox.Show("清除完成！");

        }