c# - backgroundWorker and progressChanged not working -

i cant progress bar work! if execute following code bar remains empty if code gets executed reportprogress doesnt seem update anything..:

namespace gpuz_2  { public partial class form1 : form {     public form1()     {         initializecomponent();          gpuzdata test = new gpuzdata         {         };          //invio l'oggetto al thread backgroundworker         backgroundworker1.runworkerasync(test);     }       private void backgroundworker1_dowork(object sender, doworkeventargs e)     {         //         // e.argument contains whatever sent background worker         // in runworkerasync. can cast original type.         //         gpuzdata argumenttest = e.argument gpuzdata;             argumenttest.onevalue = 6;         thread.sleep(2000);         backgroundworker1.reportprogress(50);         argumenttest.twovalue = 3;         thread.sleep(2000);         backgroundworker1.reportprogress(100);           //         // now, return values generated in method.         // use e.result.         //         e.result = argumenttest;     }       private void backgroundworker1_runworkercompleted(object sender, runworkercompletedeventargs e)     {           // receive result dowork, , display it.          gpuzdata test = e.result gpuzdata;         this.text = test.onevalue.tostring() + " " + test.twovalue.tostring();       }      private void backgroundworker1_progresschanged(object sender, progresschangedeventargs e)     {         // change value of progressbar backgroundworker progress.         progressbar1.value = e.progresspercentage;         // set text.         this.text = e.progresspercentage.tostring();     } } 

}

thanks in advance help

to initialize backgroundworker, must enable progress reporting , hook event handlers:

// enable progress reporting backgroundworker1.workerreportsprogress = true;  // hook event handlers backgroundworker1.dowork += backgroundworker1_dowork; backgroundworker1.runworkercompleted += backgroundworker1_runworkercompleted; backgroundworker1.progresschanged += backgroundworker1_progresschanged;