c# - Show a form while BackgroundWorker is running -

i want display "loading form" (a form text message plus progressbar style set marquee) while backgroundworker's job isn't done. when backgroundworker done, loading form must closed automatically. although use backgroundworker, main thread should wait until it's done. able using autoresetevent noticied block main thread, form loading's progressbar freezed too.

my question is: how can show form without freeze while runing process in background , wait finish? hope it's clear.

here's current code:

    backgroundworker bw = new backgroundworker();     autoresetevent resetevent = new autoresetevent(false);     //a windows form progressbar , label     loadingoperation loadingform = new loadingoperation(statusmsg);     //that form has progressbar that's freezed. want make      // not freezed.     loadingform.show();      bw.dowork += (sender, e) =>     {         try         {             if (!e.cancel)             {                //do             }         }                 {             resetevent.set();         }     };      bw.runworkerasync();     resetevent.waitone();     loadingform.close();     messagebox.show("we done!"); 

connect backgroundworker's runworkercompleted callback close form so:

private void backgroundworker1_runworkercompleted(     object sender, runworkercompletedeventargs e) {     loadingform.close();       messagebox.show("we done!"); } 

you can delete resetevent.waitone();

you'll need make loadingform field of course.

tell me more

occurs when background operation has completed, has been canceled, or has raised exception

• backgroundworker.runworkercompleted