c# - wpf background thread updating UI control -

i have working app adds new new ribbontab , new child control grid.

i put action onto background thread child control can take while gather data database, etc.

i have following code far:

ribbon ribbon_main = new ribbon(); grid grid_main = new grid();  thread newthread2 = new thread(new threadstart(delegate { graphing_template.add_report(); })); newthread2.setapartmentstate(apartmentstate.sta);  //is required? newthread2.start();   class graphing_template() {   static void add_report()    {      ribbontab rt1 = new ribbontab();      mainwindow.ribbon_main.items.add(rt1);      // create control information database, etc.      // add control mainwindow.grid_main    } } 

i new report control created in background , added main ui when ready.

the solution went is:

     backgroundworker worker = new backgroundworker();             worker.dowork += delegate(object s, doworkeventargs args)             {                 datatable dt1 = new datatable();                ---- fill datatable                 args.result = datagrid_adventureworks_dt();             };   worker.runworkercompleted += delegate(object s, runworkercompletedeventargs args)             {                 datatable dt1 = (datatable)args.result;                 datagrid_main.itemssource = dt1.asdataview();             }; 

    private void window_loaded(object sender, routedeventargs e)     {         test4();      }     private void test1()     {         while (true)         {             this.title = datetime.now.tostring();             system.threading.thread.sleep(5000); //locks app         }     }     private void test2()     {         var thd = new system.threading.thread(() => {             while (true)             {                 this.title = datetime.now.tostring(); //exception                 system.threading.thread.sleep(5000);             }                     });         thd.start();     }      private void test3()     {   //do work on background thread         var thd = new system.threading.thread(() =>         {             while (true)             {   //use dispatcher manipulate ui                 this.dispatcher.begininvoke((action)(()                      => { this.title = datetime.now.tostring();                  }));                  system.threading.thread.sleep(5000);                  //there's nothing ever stop thread!             }         });         thd.start();     }      private async void test4()     {   //if using .net 4.5 can use async keyword         //i _think_ computation in async method runs on ui thread,          //so don't use ray tracing,          //but db or network access workstation can on          //other (ui) work whilst it's waiting         while (true)         {             await task.run(() => { system.threading.thread.sleep(5000); });             this.title = datetime.now.tostring();         }     }