實現效果：

知識運用：
　　Registry類的LocalMachine字段

　　RegistryKey類的OpenSubKey CreateSubKey SetValue方法

實現代碼：

        private void Form1_Load(object sender, EventArgs e)
        {
            RegistryKey rKey = Registry.LocalMachine;
            RegistryKey rOpen = rKey.OpenSubKey("HARDWARE",true);
            rOpen.CreateSubKey("ZHD");
            TreeNode tn0 = new TreeNode("我的電腦");
            TreeNode tn1 = new TreeNode("HKEY_LOCAL_MACHINE");
            TreeNode tn2 = new TreeNode("HARDWARE");
            TreeNode tn3 = new TreeNode("ZHD");
            tn2.Nodes.Add(tn3);
            tn1.Nodes.Add(tn2);
            tn0.Nodes.Add(tn1);
            treeView1.Nodes.Add(tn0);
            treeView1.ExpandAll();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                RegistryKey rKey = Registry.LocalMachine;
                RegistryKey rOpen = rKey.OpenSubKey("HARDWARE\\ZHD",true);
                rOpen.SetValue(textBox1.Text,textBox2.Text);
                MessageBox.Show("向註冊表中寫入信息成功！");
            }
            catch (Exception ex)
            { MessageBox.Show(ex.Message); }
        }

向註冊表中寫入信息