c# - my Gridview still freezes in backgroundworker Dowork while using this.invoke(MethodInvoker)delegate -

i want update gridview gradually while retrieving data

i've backgroundworker work function follows

    private void backgroundwrkr_dowork(object sender, doworkeventargs e)     {         datatable dtinstant = new datatable();          (int = 0; < allfiles.count; i++)         {             if (backgroundwrkr.cancellationpending)             {                 e.cancel = true;                 return;             }                 myapp.processfile(allfiles[i]);                 this.invoke((methodinvoker)delegate               {                mygrdvw.datasource = myapp.dtresults;               });               backgroundwrkr.reportprogress(100 * (i + 1) / allfiles.count);         }         backgroundwrkr.reportprogress(100);      } 

and report progress function

 private void backgroundwrkr_progresschanged(object sender, progresschangedeventargs e)         {             progressbar.value = e.progresspercentage;          } 

and backgroundwrkr complete

private void backgroundwrkr_runworkercompleted(object sender, runworkercompletedeventargs e)         {             progressbar.visible = false;             allfiles.clear();         } 

i've tried begininvoke instead of invoke , still gridview freezes! logic of proccessing files has no problem because in case put datagridview binding in workercomplete binds successfully

after 2 days of search , unsuccessful trials i've solved follows while binding seems backgroundworker working in datatable bind copy of results datatable , solves problem

private void backgroundwrkr_dowork(object sender, doworkeventargs e) {     datatable dtinstant = new datatable();      (int = 0; < allfiles.count; i++)     {         if (backgroundwrkr.cancellationpending)         {             e.cancel = true;             return;         }             myapp.processfile(allfiles[i]);             this.invoke((methodinvoker)delegate           {            mygrdvw.datasource = myapp.dtresults.copy();           });           backgroundwrkr.reportprogress(100 * (i + 1) / allfiles.count);     }     backgroundwrkr.reportprogress(100);  } 

thanks help!