C#中访问注册表

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;

namespace MyReg
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void btnOK_Click(object sender, EventArgs e)
        {
            RegistryKey pregkey;
            pregkey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon", true);
            pregkey.SetValue("DefaultUserName", "dongjichao");
           
            pregkey.SetValue("DefaultPassword", "");
            if (rdLogin.Checked)
            { pregkey.SetValue("AutoAdminLogon", "1");}
            else
            { pregkey.SetValue("AutoAdminLogon", "0");}
            pregkey.Close();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            RegistryKey pregkey;
            string strkeyValue = "";
            pregkey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon", true);
            strkeyValue =pregkey.GetValue("AutoAdminLogon").ToString();
            if (strkeyValue!="")
            {
                if (strkeyValue=="1")
                {
                    rdLogin.Checked =true;
                    rdNoLogin.Checked =false;
                }
                else
                {
                    rdLogin.Checked =false;
                    rdNoLogin.Checked =true;
                }
            }
            pregkey.Close();
        }
    }
}