c# - Client Socket not getting reponse bytes in .NET -

i creating , sending message on server socket , not getting response in return , know possible reasons same. below sample code client socket

static void main() {     int _dcpport = 9090;     iphostentry iphostinfo = dns.gethostentry("hostname");     console.writeline("got ip host info" , iphostinfo.tostring ());     ipaddress ipaddress = iphostinfo.addresslist[0];     console.writeline("got ip hadress info");      //end point of host socket connected     ipendpoint remotedapendpoint = new ipendpoint(ipaddress, _dcpport);      // create clientsocket connects host     socket clientdap = new socket(addressfamily.internetwork, sockettype.stream, protocoltype.tcp);     clientdap.connect(remotedapendpoint);     console.writeline("client socket connected remote end point");      #region input variables     string requeststring = "hello";     string responsestring = "";      byte[] requestbyte = system.text.encoding.utf8.getbytes(requeststring);     byte[] responsebyte = new byte[1024];      stringbuilder messagebuilder = new stringbuilder();     int byteresult = 0;     #endregion      try     {         //sending string bytes on socket         console.writeline("sending input " + requeststring);         clientdap.send(requestbyte);     }     catch (socketexception ex)     {          console.writeline(ex.message);     }      try     {         //recieving response bytes         byteresult = clientdap.receive(responsebyte, clientdap.available, socketflags.none);         console.writeline("recieved {0} bytes response remote end point" , byteresult);         if (clientdap.connected)         {             responsestring = encoding.utf8.getstring(responsebyte);             messagebuilder.append(responsestring);         }     }     catch (socketexception ex)     {          console.writeline(ex.message);     }      clientdap.shutdown(socketshutdown.both);     clientdap.disconnect(true);       string sresult = messagebuilder.tostring();     console.writeline(sresult);   } 

i not getting bytes when call socket.recieve() , reasons why such happening ?

from socket.send:

there no guarantee data send appear on network immediately. increase network efficiency, underlying system may delay transmission until significant amount of outgoing data collected. successful completion of send method means underlying system has had room buffer data network send

which means data may not have arrived @ server yet when call send has completed. let alone server has had time process data , return response.

and yet code charges straight ahead try receive server's response. isn't unreasonable, in , of itself. call receive would have blocked until had received some data if had specified size of buffer, rather using available, happily return 0 if there's no data yet available. receive call asking 0 bytes , that's how many you're being given.

so change line

byteresult = clientdap.receive(responsebyte, 1024, socketflags.none); 

(or better yet, introduce constant and/or use responsebyte.length or switch overload don't explicitly specify how many bytes want)