多线程中检测某个.asmx链接是否有效,该怎么解决

try 
{ 
  
System.Net.WebRequest   myRequest   =   System.Net.WebRequest.Create( "http://192.168.0.6/rootserver/DirService.asmx "); 

  
System.Net.WebResponse     myResponse   =   myRequest.GetResponse(); 


return   "ok "; 
} 
catch(Exception   ex) 
{ 
return   ex.Message.ToString(); 
} 

//引入命名空间MSXML2
using MSXML2;
public bool getWSStatus()
        {
            string url = "http://192.168.105.10/hotelwebsrv/hotelwebsrv.asmx";
            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,   就是不存在或没权访问   
                if (iStatus == 200)
                    return true;
                else
                    return false;
            }
            catch
            {
                return false;
            }
        }