C# 获取并更改当前机器名

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

using System.Net;
using System.Runtime.InteropServices;
namespace Ex14_01
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }
       
        [DllImport（“kernel32.dll“EntryPoint=“SetComputerNameEx“）]
        public static extern int SetComputerNameEx（int type String strname）;
        private void Form1_Load（object sender EventArgs e）
        {
            this.label3.Text = Dns.GetHostName（）;

       
        }
        private void button1_Click（object sender EventArgs e）
        {
            if （this.textBox2.Text != ““）

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2010-04-06 13:10  Ex14_01\
     文件         910  2007-07-11 11:34  Ex14_01.sln
     文件       14336  2007-07-11 11:34  Ex14_01.suo
     目录           0  2010-04-06 13:10  Ex14_01\bin\
     目录           0  2010-04-06 13:10  Ex14_01\bin\Debug\
     文件       20480  2007-07-11 11:34  Ex14_01\bin\Debug\Ex14_01.exe
     文件       28160  2007-07-11 11:34  Ex14_01\bin\Debug\Ex14_01.pdb
     文件        5632  2007-07-11 11:34  Ex14_01\bin\Debug\Ex14_01.vshost.exe
     文件        3221  2007-07-11 11:34  Ex14_01\Ex14_01.csproj
     文件        2077  2007-07-11 11:34  Ex14_01\Form1.cs
     文件        4229  2007-07-11 11:34  Ex14_01\Form1.Designer.cs
     文件        5814  2007-07-11 11:34  Ex14_01\Form1.resx
     目录           0  2010-04-06 13:10  Ex14_01\obj\
     目录           0  2010-04-06 13:10  Ex14_01\obj\Debug\
     文件         842  2007-07-11 11:34  Ex14_01\obj\Debug\Ex14_01.csproj.GenerateResource.Cache
     文件       20480  2007-07-11 11:34  Ex14_01\obj\Debug\Ex14_01.exe
     文件         180  2007-07-11 11:34  Ex14_01\obj\Debug\Ex14_01.Form1.resources
     文件       28160  2007-07-11 11:34  Ex14_01\obj\Debug\Ex14_01.pdb
     文件         180  2007-07-11 11:34  Ex14_01\obj\Debug\Ex14_01.Properties.Resources.resources
     目录           0  2010-04-06 13:10  Ex14_01\obj\Debug\TempPE\
     文件         268  2007-07-11 11:34  Ex14_01\obj\Ex14_01.csproj.FileList.txt
     文件         466  2007-07-11 11:34  Ex14_01\Program.cs
     目录           0  2010-04-06 13:10  Ex14_01\Properties\
     文件        1162  2007-07-11 11:34  Ex14_01\Properties\AssemblyInfo.cs
     文件        2868  2007-07-11 11:34  Ex14_01\Properties\Resources.Designer.cs
     文件        5612  2007-07-11 11:34  Ex14_01\Properties\Resources.resx
     文件        1090  2007-07-11 11:34  Ex14_01\Properties\Settings.Designer.cs
     文件         249  2007-07-11 11:34  Ex14_01\Properties\Settings.settings