c#中禁用和開啟網卡

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Management;using System.Collections;namespace NetWorkControl{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();            NetWorkList();        }        /// <summary>        /// 網卡列表        /// </summary>        public void NetWorkList()        {            string manage = "SELECT * From Win32_NetworkAdapter";            ManagementObjectSearcher searcher = new ManagementObjectSearcher(manage);            ManagementObjectCollection collection = searcher.Get();            List<string> netWorkList = new List<string>();            foreach (ManagementObject obj in collection)            {                netWorkList.Add(obj["Name"].ToString());                            }           this.cmbNetWork.DataSource = netWorkList;        }        /// <summary>        /// 禁用網卡        /// </summary>5        /// <param name="netWorkName">網卡名</param>        /// <returns></returns>        public bool DisableNetWork(ManagementObject network)        {            try            {                network.InvokeMethod("Disable", null);                return true;            }            catch            {                return false;            }        }        /// <summary>        /// 啟用網卡        /// </summary>        /// <param name="netWorkName">網卡名</param>        /// <returns></returns>        public bool EnableNetWork(ManagementObject network)        {            try            {                network.InvokeMethod("Enable", null );                return true;            }            catch            {                return false;            }                    }        /// <summary>        /// 網卡狀態        /// </summary>        /// <param name="netWorkName">網卡名</param>        /// <returns></returns>        public bool NetWorkState(string netWorkName)        {            string netState = "SELECT * From Win32_NetworkAdapter";            ManagementObjectSearcher searcher = new ManagementObjectSearcher(netState);            ManagementObjectCollection collection = searcher.Get();            foreach (ManagementObject manage in collection)            {                if (manage["Name"].ToString() == netWorkName )                {                    return true;                }            }            return false;        }        /// <summary>        /// 得到指定網卡        /// </summary>        /// <param name="networkname">網卡名字</param>        /// <returns></returns>        public ManagementObject NetWork(string networkname)        {            string netState = "SELECT * From Win32_NetworkAdapter";            ManagementObjectSearcher searcher = new ManagementObjectSearcher(netState);            ManagementObjectCollection collection = searcher.Get();            foreach (ManagementObject manage in collection)            {                if (manage["Name"].ToString() == networkname)                {                    return manage;                }            }                        return null;        }        private void btnStart_Click(object sender, EventArgs e)        {            if (NetWorkState(this.cmbNetWork.SelectedValue.ToString()))            {                if (!EnableNetWork(NetWork(this.cmbNetWork.SelectedValue.ToString())))                {                    MessageBox.Show("開啟網卡失敗!");                }                else                {                    MessageBox.Show("開啟網卡成功!");                }            }            else            {                MessageBox.Show("網卡己開啟!");            }            NetWorkList();        }        private void btnStop_Click(object sender, EventArgs e)        {            if (NetWorkState(this.cmbNetWork.SelectedValue.ToString()))            {                if (!DisableNetWork(NetWork(this.cmbNetWork.SelectedValue.ToString())))                {                    MessageBox.Show("禁用網卡失敗!");                }                else                {                    MessageBox.Show("禁用網卡成功!");                }            }            else            {                MessageBox.Show("網卡己禁用!");            }            NetWorkList();        }    }}