C#获取本地计算机名IP，Mac地址[1]

using System;
using System.Drawing;
using System.Management;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace MAC_IP_name
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.TextBox txtMac;
        private System.Windows.Forms.TextBox txtIp;
        private System.Windows.Forms.TextBox txtName;
        private System.Windows.Forms.Label lblMac;
        private System.Windows.Forms.Label lblIp;
        private System.Windows.Forms.Label lblName;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows 窗体设计器生成的代码
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.label4 = new System.Windows.Forms.Label();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.button2 = new System.Windows.Forms.Button();
            this.txtMac = new System.Windows.Forms.TextBox();
            this.txtIp =