c# - Update GUI components from Begininvoke -

so have basic windows application want count 1 10000 , show numbers in label:

private void button1_click(object sender, eventargs e)     {         thread thread = new thread(() =>         {             (int = 0; < 10000; i++)             {                 begininvoke((methodinvoker)delegate ()                 {                     label3.text = i.tostring();                 });             }         });          thread.start();  } 

the problem label text doesn't update , shows last loop counter i.e. 9999. begininvoke called on ui thread? why not label updated correctly?

thanks.

because begininvoke asynchronous call, you're sending many updates text box update fast enough, time text box has got around drawing, it's counted 10000!

you can synchronously update text, is, calling loop halt until text box has updated , finished, use invoke instead of begininvoke.