c# - Form does not displayed as Dialog inside backgroundworker? -

the form not displayed dialog inside backgroundworker?

here code:

//from form1         private void backgroundworkerresult_dowork(object sender, doworkeventargs e)     {         //do here          backgroundworkerresult.reportprogress(100);          frmmessagebox frmmsgbox = new frmmessagebox();         frmmsgbox.showdialog();     } 

even though showed frmmsgbox dialog can still click form1 supposed not? how can fix this?

i created simple code sample can use understand how background worker works. copy code test form , add following controls

1. label control - name 'lblstatus'
2. progressbar control - should named progressbar1.
3. add 2 buttons named 'btnstartasyncoperation' , 'btncancel' , link click events.

basically should display results in runworkercompleted event

    public partial class form1 : form     {         backgroundworker backgroundworker;          public form1()         {             initializecomponent();             backgroundworker = new backgroundworker {workerreportsprogress = true, workersupportscancellation = true};              backgroundworker.dowork += new doworkeventhandler(backgroundworker_dowork);             backgroundworker.progresschanged += new progresschangedeventhandler(backgroundworker_progresschanged);             backgroundworker.runworkercompleted += new runworkercompletedeventhandler(backgroundworker_runworkercompleted);          }          void backgroundworker_runworkercompleted(object sender, runworkercompletedeventargs e)         {             if (e.cancelled)                 lblstatus.text = "task cancelled.";             else if (e.error != null)                 lblstatus.text = "error - " + e.error.message;             else                 lblstatus.text = "task completed...";              btnstartasyncoperation.enabled = true;             btncancel.enabled = false;         }          void backgroundworker_progresschanged(object sender, progresschangedeventargs e)         {             progressbar1.value = e.progresspercentage;             lblstatus.text = "processing......" + progressbar1.value.tostring() + "%";         }          void backgroundworker_dowork(object sender, doworkeventargs e)         {             (int = 0; < 100; i++)             {                 system.threading.thread.sleep(100);                 backgroundworker.reportprogress(i);                 if (backgroundworker.cancellationpending)                 {                     e.cancel = true;                     backgroundworker.reportprogress(0);                     return;                 }             }             backgroundworker.reportprogress(100);         }          private void btnstartasyncoperation_click(object sender, eventargs e)         {             btnstartasyncoperation.enabled = false;             btncancel.enabled = true;             backgroundworker.runworkerasync();         }          private void btncancel_click(object sender, eventargs e)         {             if (backgroundworker.isbusy)             {                 backgroundworker.cancelasync();             }         }     } 

edited per comment op

in dowork event, set string follows

 e.result = "your string"; 

and in runworkercompleted event

string muresult = convert.tostring(e.result); 

note: e.result object can set custom classes multiple properties in it.