关于注册表的作用，这里暂不作介绍。主要讨论下注册表的读写方法：

1，首先我们认识下注册表如何让打开：程序=》搜索=》regedit=》

2注册表包含五大类分别是：

1，HKEY_CLASSES_ROOT

2，HKEY_CURRENT_USER

3，HKEY_LOCAL_MACHING

4，HKEY_USERS

5，HKEY_CURRENT_CONFIG

3注册表的写方法：

 //写入注册表

        private void button1_Click(object sender, EventArgs e)

        {

            RegistryKey rk = null;

            if (Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft").SubKeyCount <= 0)

            {

                Registry.LocalMachine.DeleteSubKey("SOFTWARE\\Microsoft");

                Registry.LocalMachine.CreateSubKey("SOFTWARE\\Microsoft");

            }

            rk=Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft",true );

            rk.SetValue("123","练习写入注册表");

            MessageBox.Show("写入成功");

            rk.Close();

        }

4注册表的读方法：

 //读取注册表

        private void button2_Click(object sender, EventArgs e)

        {

            try

            {

                RegistryKey rk = null;

                rk = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft", true);

                if (rk.GetValue("123") != null)

                {

                    richTextBox1.Text = rk.GetValue("123").ToString();

                }

                else

                {

                    MessageBox.Show("没有关键值");

                }

            }

            catch

            { }

        }