c# - Background worker issue with bluetooth socket -

i fixing bug in wpf application. application requires reading data bluetooth socket 32 feets library. current issue have when backgroundworker has been cancelled using cancelasync() , wait after few minutes, dowork event doesn't fire anymore. if stop backgroundworker within minute, dowork fire. know reason , how resolve this?

here code use dowork:

void startthread_dowork(object sender, doworkeventargs e) {     backgroundworker worker = sender backgroundworker;      try{         using (bluetoothclient cliente = new bluetoothclient())         {           //  bluetoothendpoint point = new bluetoothendpoint(bluetoothaddress.parse((string)e.argument), bluetoothservice.serialport);              cliente.connect(bluetoothaddress.parse((string)e.argument), bluetoothservice.serialport);              using (stream stream = cliente.getstream())             {                     while (true)                     {                            system.windows.forms.application.doevents();                            if (worker.cancellationpending && !isactive)                            {                                e.cancel = true;                                break;                            }                            else                            {                                if (stream.read(data, 0, 8) != -1 && isactive)                                {                                    decoder.decode(data);                                }                            }                     }             }         }     }    catch     {    } } 

the code of constructing backgroundworker in constructor:

startthread = new backgroundworker();  startthread.workersupportscancellation = true; startthread.dowork += startthread_dowork; 

thanks in advance.