[DllImport("wininet.dll")]

        private extern static bool InternetGetConnectedState(int Description, int ReservedValue);

        #region 方法一

        /// <summary>

        /// 用于检查网络是否可以连接互联网,true表示连接成功,false表示连接失败

        /// </summary>

        /// <returns></returns>

        public static bool IsConnectInternet()

        {

            int Description = ;

            return InternetGetConnectedState(Description, );

        }

        #endregion 方法一

        #region 方法二

        /// <summary>

        /// 用于检查IP地址或域名是否可以使用TCP/IP协议访问(使用Ping命令),true表示Ping成功,false表示Ping失败

        /// </summary>

        /// <param name="strIpOrDName">输入参数,表示IP地址或域名</param>

        /// <returns></returns>

        public static bool PingIpOrDomainName(string strIpOrDName)

        {

            try

            {

                Ping objPingSender = new Ping();

                PingOptions objPinOptions = new PingOptions();

                objPinOptions.DontFragment = true;

                string data = "";

                byte[] buffer = Encoding.UTF8.GetBytes(data);

                int intTimeout = ;

                PingReply objPinReply = objPingSender.Send(strIpOrDName, intTimeout, buffer, objPinOptions);

                string strInfo = objPinReply.Status.ToString();

                if (strInfo == "Success")

                {

                    return true;

                }

                else

                {

                    return false;

                }

            }

            catch (Exception)

            {

                return false;

            }

        }

        #endregion 方法二