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   源码介绍

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

using Microsoft.Win32;
namespace Ex14_08
{ 
    public partial class Form1 : Form
    {
        static string strnew = null;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                RegistryKey reg = Registry.LocalMachine.OpenSubKey(@"System\CurrentControlSet\Services\Tcpip\Linkage");
                string []str= (String[])reg.GetValue("Route");
                strnew = str[0].Substring(1, str[0].Length - 2);
                string path = @"System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\"   strnew;
                RegistryKey regIp = Registry.LocalMachine.OpenSubKey(path);
                string strDNS = regIp.GetValue("NameServer", "Null", RegistryValueOptions.None).ToString();
                this.textBox1.Text = strDNS;
            }
            catch (Exception ey)
            {
                MessageBox.Show(ey.Message);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Enabled == false)
            {
                this.button1.Text = "确定";
                this.textBox1.Enabled=true;
                return;
            }
            if (this.textBox1.Enabled == true)
            {
                string str= this.textBox1.Text;
                string path = @"System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\"   strnew;
                Registry.LocalMachine.CreateSubKey(path).SetValue("NameServer", str, RegistryValueKind.String);
                this.textBox1.Enabled = false;
                this.button1.Text = "设置";
                MessageBox.Show("  DNS修改成功\r\n请重新启动计算机");

            }
        }
    }
}