c# - Multithreaded TCP server and client -

i search around before asking problem, looking example of tcp server , client in c#.

i found this link,i used given code link unfortunately there's problem , i'm stocked!

the following code complete code server (console)

using system; using system.collections.generic; using system.linq; using system.text; using system.net.sockets;  namespace tcp_server_console {     class program     {         static void main(string[] args)         {             tcplistener serversocket = new tcplistener(8888);             int requestcount = 0;             tcpclient clientsocket = default(tcpclient);             serversocket.start();             console.writeline(" >> server started");             clientsocket = serversocket.accepttcpclient();             console.writeline(" >> accept connection client");             requestcount = 0;             while ((true))             {                 try                 {                     requestcount = requestcount + 1;                     networkstream networkstream = clientsocket.getstream();                     byte[] bytesfrom = new byte[10025];                     networkstream.read(bytesfrom, 0, (int)clientsocket.receivebuffersize);                     string datafromclient = system.text.encoding.ascii.getstring(bytesfrom);                     datafromclient = datafromclient.substring(0, datafromclient.indexof("$"));                     console.writeline(" >> data client - " + datafromclient);                     string serverresponse = "last message client" + datafromclient;                     byte[] sendbytes = encoding.ascii.getbytes(serverresponse);                     networkstream.write(sendbytes, 0, sendbytes.length);                     networkstream.flush();                     console.writeline(" >> " + serverresponse);                 }                 catch (exception ex)                 {                     console.writeline(ex.tostring());                 }             }             clientsocket.close();             serversocket.stop();             console.writeline(" >> exit");             console.readline();         }     } }   /*handleclient class */ using system; using system.collections.generic; using system.linq; using system.net.sockets; using system.text; using system.threading; using system.threading.tasks;  namespace tcp_server_console {     public class handleclient     {         tcpclient clientsocket;         string clno;         public void startclient(tcpclient inclientsocket, string clineno)         {             this.clientsocket = inclientsocket;             this.clno = clineno;             thread ctthread = new thread(dochat);             ctthread.start();         }          private void dochat()         {             int requestcount = 0;             byte[] bytesfrom = new byte[10025];             string datafromclient = null;             byte[] sendbytes = null;             string serverresponse = null;             string rcount = null;             requestcount = 0;             while ((true))             {                 try                 {                     requestcount = requestcount + 1;                     networkstream networkstream = clientsocket.getstream();                     networkstream.read(bytesfrom, 0, (int)clientsocket.receivebuffersize);                     datafromclient = system.text.encoding.ascii.getstring(bytesfrom);                     datafromclient = datafromclient.substring(0, datafromclient.indexof("$"));                     console.writeline(" >> " + "from client-" + clno + datafromclient);                     rcount = convert.tostring(requestcount);                     serverresponse = "server clinet(" + clno + ") " + rcount;                     sendbytes = encoding.ascii.getbytes(serverresponse);                     networkstream.write(sendbytes, 0, sendbytes.length);                     networkstream.flush();                     console.writeline(" >> " + serverresponse);                 }                 catch (exception ex)                 {                     console.writeline(" >> " + ex.tostring());                 }             }         }     } } 

the following code complete code client(windows form):

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.net.sockets; using system.text; using system.threading.tasks; using system.windows.forms;  namespace tcp_client_sample {     public partial class form1 : form     {          system.net.sockets.tcpclient clientsocket = new system.net.sockets.tcpclient();         networkstream serverstream;         public form1()         {             initializecomponent();         }         private void form1_load(object sender, eventargs e)         {             label_status.text = "client started, connecting...";             try {                 clientsocket.connect("127.0.0.1", 8888);                 if (clientsocket.connected)                 {                     label_status.text = "connected";                     label_status.forecolor = color.green;                 }              }               catch (exception xe) {                   messagebox.show("oops!!! server must started first! \n\n" + xe.tostring());               }          }          //function send message server (on button click)         private void btn_send_click(object sender, eventargs e)         {             try {                 networkstream serverstream = clientsocket.getstream();                 byte[] outstream = system.text.encoding.ascii.getbytes("message client$");                 serverstream.write(outstream, 0, outstream.length);                 serverstream.flush();                 byte[] instream = new byte[10025];                 serverstream.read(instream, 0, (int)clientsocket.receivebuffersize);                 string returndata = system.text.encoding.ascii.getstring(instream);                 chatbox.appendtext(">> server: " + returndata);             }             catch (exception ex) {                 messagebox.show("unable send data: " + ex);             }         }     } } 

everytime execute code of server works , started. when execute client, server given me exception error "specified argument out of range".

here complete exception error:

system.argumentoutofrangeexception: specified argument out of range of valid values. parameter name: size    @ system.net.sockets.networkstream.read(byte[] buffer, int32 offset, int32 size)    @ tcp_server_console.program.main(string[] args) in c:\users\user\documents\visual studio 2015\projects\tcp_server_console\tcp_server_console\program.cs:line 50 

i'm getting same error everytime click btn_send client form.

i stock here , don't know what's problem since first time i'm work tcp socket.

anynone can me?

the problem lies in code used 2 different sizes

byte[] instream = new byte[10025]; serverstream.read(instream, 0, (int)clientsocket.receivebuffersize); 

in this. youve reserved space 10025 bytes, recievebuffersize maybe size, bigger or smaller, if bigger, error.

if make read call call same length byte array wont have problem.