C# Async socket server receives only one message from client -

i'm quite new sockets programming. hope problem presented understandable.

the problem when use client's button1_click send textbox's content - server gets first message. have no idea what's going wrong.

what might problem?

here server:

    public partial class form1 : form {     socket server;     byte[] bytedata = new byte[1024];      public form1()     {         initializecomponent();     }      private void form1_load(object sender, eventargs e)     {         try         {             server = new socket(addressfamily.internetwork,                                 sockettype.stream,                                 protocoltype.tcp);             ipendpoint endpoint = new ipendpoint(ipaddress.any, 20000);              server.bind(endpoint);             server.listen(1);             server.beginaccept(new asynccallback(accept), null);             textbox1.text = "server started...";         }         catch(exception ex)         {             messagebox.show(ex.message);         }     }      private void accept(iasyncresult ar)     {         try         {             socket client = server.endaccept(ar);             server.beginaccept(new asynccallback(accept), null);             client.beginreceive(bytedata, 0, bytedata.length,                 socketflags.none, new asynccallback(receive), client);          }         catch(exception ex)         {             messagebox.show(ex.message);         }     }      private void receive(iasyncresult ar)     {         socket client = (socket)ar.asyncstate;         client.endreceive(ar);          textbox1.invoke(new action(delegate ()         {             textbox1.appendtext(environment.newline                          + encoding.ascii.getstring(bytedata));         }));         bytedata = null;     } } 

and here client:

    public partial class form1 : form {     socket client;      public form1()     {         initializecomponent();     }      private void textbox1_textchanged(object sender, eventargs e)     {         if (textbox1.text == null)             button1.enabled = false;         else             button1.enabled = true;     }      private void form1_load(object sender, eventargs e)     {         try         {             client = new socket(addressfamily.internetwork,                                 sockettype.stream,                                 protocoltype.tcp);             ipaddress ip = ipaddress.parse("127.0.0.1");             ipendpoint ipendpoint = new ipendpoint(ip, 20000);             client.connect(ipendpoint);         }         catch(exception ex)         {             messagebox.show(ex.message);         }     }      private void button1_click(object sender, eventargs e)     {         try         {              byte[] bytedata = encoding.ascii.getbytes(textbox1.text);             client.beginsend(bytedata, 0, bytedata.length, socketflags.none,                             new asynccallback(send), null);             textbox1.text = string.empty;         }         catch(exception ex)         {             messagebox.show(ex.message);         }     }      private void send(iasyncresult ar)     {         try         {             client.endsend(ar);         }         catch (objectdisposedexception)         { }         catch(exception ex)         {             messagebox.show(ex.message);         }     } } 

in async, got re-init beginreceive in server side whenever want listen message.

therefore, in receive callback, should re-init beginreceive after endreceive. otherwise cannot next message:

private void receive(iasyncresult ar) {     socket client = (socket)ar.asyncstate;     client.endreceive(ar);     client.beginreceive(bytedata, 0, bytedata.length, //add beginreceive again         socketflags.none, new asynccallback(receive), client);      textbox1.invoke(new action(delegate ()     {         textbox1.appendtext(environment.newline                      + encoding.ascii.getstring(bytedata));     }));     bytedata = null; } 

for more of working example async, check out: sending value server client sockets