本文在C#中使用XMLHTTP对网页的可访问性进行了演示：

private bool checkWeb()
        {

            string url = "http://XXXXX";
            XMLHTTP http = new XMLHTTP();
            try
            {
                http.open("GET ", url, false, null, null);
                http.send(null);
                int iStatus = http.status;
                //如果取得的网页状态不正确, 就是出问题了 
                if (iStatus == 200)
                {
                    isOn = " is working";
                    return true;

                }
                else
                {
                    isOn = " is not working";
                    return false;
                }
            }
            catch (Exception ex)
            {

            }
            return false;
        }