学步园

代码如下：

      [DllImport("wininet.dll")]

        private extern static bool InternetGetConnectedState(int Description, int ReservedValue);
        public static bool IsConnectedToInternet()
        {
            int Desc = 0;
            return InternetGetConnectedState(Desc, 0);
        } 

       private void button1_Click(object sender, EventArgs e)
        {
         //检测网络状态 
            if (!IsConnectedToInternet())
            {
                MessageBox.Show("当前不能连接到服务器，请检查网络、防火墙等设备！");
                return;
            }

       }