c# - System.ObjectDisposedException throwed on WebSocket communication -

i'm trying communicate between web browser client , asp.net server using websockets.

i make set of requests, of different sizes , seconds of elapsed time between each of them. 3 first ones pass correctly, precise one, nothing in particular other, close websocket connection, throw exception on server side.

the error message , stack trace of exception :

fatal error: cannot access disposed object.
object name: 'system.web.websockets.aspnetwebsocket'.
@ system.web.websockets.aspnetwebsocket.throwifdisposed()
@ system.web.websockets.aspnetwebsocket.sendasyncimpl(arraysegment 1 buffer, websocketmessagetype messagetype, boolean endofmessage, cancellationtoken cancellationtoken, boolean performvalidation)
@ system.web.websockets.aspnetwebsocket.sendasync(arraysegment 1 buffer, websocketmessagetype messagetype, boolean endofmessage, cancellationtoken cancellationtoken)
@ [my code path here...]

it may threading problem, because i'm using async methods everywhere functions communicate websockets.

i know exception throwed code (at socket.sendasync):

public class sockettranslater {      private websocket socket;     private javascriptserializer serializer;      // [...]      private arraysegment<byte> encode(object data)     {         string json = serializer.serialize(data);         return (new arraysegment<byte>(encoding.utf8.getbytes(json)));     }       public async task send(object packet)     {         arraysegment<byte> encoded = this.encode(packet);          await socket.sendasync(encoded, websocketmessagetype.text, true, cancellationtoken.none);     } } 

the socket created class :

public class eventsender : ihttphandler {     private static list<sockettranslater> sockettranslaters = new list<sockettranslater>();      public void processrequest(httpcontext context)     {         this.id = context.request.userhostname + ":" + context.request.useragent;         if (context.iswebsocketrequest)         {             context.acceptwebsocketrequest(processsocket);         }             }      private async task managesocket(aspnetwebsocketcontext context)     {         websocket socket = context.websocket;         sockettranslater translater = new sockettranslater(socket);         translaters.add(translater);          while (true)         {             // manage messages, using other class send responses.             translater.send(/* struct here */);         }     } 

unhopefully, project big put code here.

any idea of error source, or additional information require ?

update:

after more tests, don't have exception time time. same thing, server seems have random comportment.

that makes problem weirder...

finally, after more tests , interesting questions , answer here (like this one), understood:

my problem was stocking websockets in dictionary linked hostnames. on first connection of client on server, worked correctly. if refresh page, websocket closed server (because there no chance use again) et 1 created.

but used same key both sockets, deprecated , new one, trying answer new client previous socket, closed. (disposed = closed asp.net).

so thing had remove socket list on client disconnection (at end of managesocket). , forbid client connect twice same hostname.

i didn't mention part linking sockets hostnames, admit couldn't me... apologize.