DIServerInfo[] servers = MWSProxy.GetAllDIServers(null);
if (servers != null) {
   for(int i=0; i < servers.Length ; i++) {
       Console.WriteLine("("+(i+1)+") "+servers[i].Name);
   }
       }

PingDIServerRequest pingReq = new PingDIServerRequest();
pingReq.TimeOut = (PING_TIME_OUT);
DIServiceInfo diInfo1 = new DIServiceInfo();
diInfo1.DomainName = DI_DOMAIN_NAME;          
diInfo1.ServiceName = DI_SERVICE_NAME1;
pingReq.DIServiceInfo = diInfo1;
EPingState pingResult = DIWSProxy1.pingDIServer(pingReq);