vb.net - Form is not updating, after custom class event is fired -

i'm having issue main form isn't updating though see event fire off. let me explain situation , share of code i'm sure horrible since i'm amateur.

i created class take in settings running process in background. add custom events in class use in form instead of timer.

i put break on 2 subs handle events , see them kicked off install starts.

i @ data , it's coming across , no exceptions thrown.

at first thought because datagridview had latency issues. set double buffered through tricks found didn't matter. there still 10 second delay before data showed in datagrid.

i thought , decided didn't need datagridview , replaced control multiline textbox, didn't make difference. it's still taking 10 seconds or longer show updates form/textbox.

i've included of code below.

public shared withevents np newprocess 

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private sub form1_load(byval sender object, byval e system.eventargs) handles me.load         try             np = new newprocess             addhandler np.installfinished, addressof np_installfinished             addhandler np.installstarted, addressof np_installstarted         catch ex exception          end try      end sub 

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protected sub np_installfinished(byval description string, byval exitcode integer)     installinprocess = false      if not description = nothing         if not exitcode = nothing             addlog(string.format("completed install of {0} ({1}).", description, exitcode))         else             addlog(string.format("completed install of {0}.", description))         end if     end if     refreshbuttons()     updatelistofapps()     np.dispose() end sub 

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protected sub np_installstarted(byval description string)     installinprocess = true      if not description = nothing addlog(string.format("started install of {0}.", description)) end sub 

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public class newprocess     dim processname string     dim processvisibile boolean     dim arguments string     dim waitforexit boolean     dim description string     dim shellexecute boolean     dim ec integer = nothing 'exit code     private isbusy boolean = nothing     dim th threading.thread      public event installfinished(byval description string, byval exitcode integer)      public event installstarted(byval description string)      public function busy() boolean         if isbusy = nothing return false         return isbusy     end function      public function exitcode() integer         return ec     end function      public function processdescription() string         return description     end function      ''' <summary>     ''' starts new multithreaded process.     ''' </summary>     ''' <param name="path">path of file run</param>     ''' <param name="visible">should application visible?</param>     ''' <param name="arg">arguments</param>     ''' <param name="waitforexit">wait application exit?</param>     ''' <param name="description">description show in logs</param>     ''' <remarks>starts new multithreaded process.</remarks>     public sub startprocess(byval path string, byval visible boolean, optional byval arg string = nothing, optional byval waitforexit boolean = false, optional byval description string = nothing)          try             me.processname = path             me.processvisibile = visible             if arguments = nothing me.arguments = arg             me.description = description             me.waitforexit = waitforexit              if isbusy , waitforexit                 messagebox.show("another install in process, please wait previous install finish.", "warning", messageboxbuttons.ok, messageboxicon.warning)                 exit sub             end if              if not fn_fileexists(processname)                 messagebox.show("could not find file " & processname & ".", "could not start process because file missing.", messageboxbuttons.ok, messageboxicon.error)                 exit sub             end if              th = new threading.thread(addressof newthread)              th                 .isbackground = true                 if not description nothing .name = description                 .start()             end         catch ex exception          end try     end sub      private sub newthread()         dim p process          try             p = new process              p                 .enableraisingevents = true                 .startinfo.arguments = arguments                 .startinfo.filename = processname                 .startinfo.createnowindow = processvisibile             end              if processvisibile                 p.startinfo.windowstyle = processwindowstyle.normal             else                 p.startinfo.windowstyle = processwindowstyle.hidden             end if              p.start()             isbusy = true             raiseevent installstarted(description)              if waitforexit                 while p.hasexited = false                     threading.thread.sleep(500)                 loop                 isbusy = false                 raiseevent installfinished(description, p.exitcode)             end if              ec = p.exitcode            catch ex exception          end try     end sub      public sub dispose()         processname = nothing         processvisibile = nothing         arguments = nothing         waitforexit = nothing         description = nothing         ec = nothing         installinprocess = nothing         th.join()         memorymanagement.flushmemory()     end sub  end class 

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sub addlog(byval s string)     try          s = string.format("[{0}] {1}", timeofday.toshorttimestring, s)          form1.tblogs.appendtext(s & vbcrlf)          using st new streamwriter(logfilepath, true)             st.writeline(s)             st.flush()         end using      catch ex exception     end try end sub 

any idea's? i'm @ complete loss.

i've tried adding application.doevents, me.refresh , quite few other things :(

    form1.tblogs.appendtext(s & vbcrlf) 

standard vb.net trap. form1 class name, not reference form. unfortunately, vb.net implemented anachronism vb6 legal. falls apart when use threads. you'll another form object automatically created, 1 isn't visible because show() method never called. otherwise dead doornail since thread not pumping message loop.

you'll need pass reference actual form object user looking @ worker class. value of me in form1 code. have use control.invoke since isn't legal update controls thread. recommend fire event instead, 1 form1 can subscribe to, worker class isn't infected implementation details of ui.