vb.net - Background Workers and Successive Events -

i'm again, more code last time. may reference previous questions here , there question independent

i managed convince employer drop proprietary serial port communications library made use, starting scratch serialports , backgroundworkers know how work.

here code:

imports system imports system.io.ports  public class form1      'serialport port , backgroundworker worker declared in form      delegate sub appendtext_delegate(byval txtbox textbox, byval str string)      private sub form1_load(sender system.object, e system.eventargs) handles mybase.load          port.portname = ("com9")         port.baudrate = 115200         port.parity = parity.none         port.stopbits = stopbits.one         port.handshake = handshake.none         port.readtimeout = 1000         port.writetimeout = 1000          port.open()          addhandler port.datareceived, addressof datareceived          worker.workerreportsprogress = true         worker.workersupportscancellation = true      end sub      private sub btnsend_click(sender system.object, e system.eventargs) handles btnsend.click         port.write(txtinput.text & vbcrlf)     end sub      private sub datareceived(sender object, e serialdatareceivedeventargs)         worker.runworkerasync()     end sub      private sub backgroundworker1_dowork(sender system.object, e system.componentmodel.doworkeventargs) handles worker.dowork          if worker.cancellationpending             e.cancel = true         end if         appendtext_threadsafe(me.txtoutput, port.readline())      end sub      private sub appendtext_threadsafe(byval txtbox textbox, byval str string)         if txtbox.invokerequired             dim mydelegate new appendtext_delegate(addressof appendtext_threadsafe)             me.invoke(mydelegate, new object() {txtbox, str})         else             txtbox.appendtext(str)         end if     end sub  end class 

at moment not sure how datareceived event , backgroundworker work together. should put worker.runworkerasync() calls dowork() when datareceived event raised? should bind both events same method?

thanks help, , apologies simplicity of question. i've started backgroundworkers , still finding footing, speak.

the datareceived event of serialport class raised on background thread, not block ui thread , therefore don't need use backgroundworker in case. because datareceived called on background thread, need use invoke if need update ui controls handler.