My Socket script do not receive data, HELP!

Question

I write this script to get infomation from a Half-Life CS server.
Use the script below, I can connect to the server and send my query string,
But nothing response to me! Why? Please help me ! Thank you very much !!!
import java.net.*;
import java.io.IOException;
public class mysq{
public void query(){
String str="info";
String ip="210.78.148.46";
int port=27026;
System.out.println("Address="+ip+":"+port);
try {
//Connect to the Server
DatagramSocket ds = new DatagramSocket();
InetAddress iaddr = InetAddress.getByName(ip);
ds.connect(iaddr,port);
ds.setSoTimeout(5000);
System.out.println("Connected OK!");
//Send the DatagramPacket
DatagramPacket dps=new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName(ip),port);
ds.send(dps);
System.out.println("Sent OK!");
//Receive the DatagramPacket
byte[] buf=new byte[1024];
DatagramPacket dpr=new DatagramPacket(buf,buf.length);
ds.receive(dpr);
String strRecv=new String(dpr.getData(),0,dpr.getLength());
System.out.println("Received OK! \nGot Data: "+strRecv);
ds.close();//Close DatagramSocket
catch(IOException ex){System.out.println("\nError! ");}
public static void main(String args[]){
mysq sq = new mysq();
sq.query();
}The running result:
Address=210.78.148.46:27026
Connected OK!
Sent OK!
Error!  (can not receive anything)

Answer 1

But nothing response to me! Why? They did. Perhaps you should check again.
http://forum.java.sun.com/thread.jspa?threadID=578559&tstart=0