C#判断WebService接口是否可用

     using MSXML2;   

          public bool InterfaceEnble()
        {
            string url = "http://localhost:81/WebServiceLogin.asmx";
            XMLHTTP http = new XMLHTTP();
            try
            {
                http.open("GET ", url, false, null, null);
                http.send(null);
                int iStatus = http.status;
                //如果状态不为200，就是不能调用此接口 
                if (iStatus == 200)
                    return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("接口调用失败," + ex);
            }

            return false;
        }

判断接口是否可用