c# - Task causing strange behavior in form_load event -

i have task runs in form_load event of usercontrol in winforms:

private void ucdeviceinsert_load(object sender, eventargs e)     {         system.threading.tasks.task gettbox = system.threading.tasks.task.run(async () =>         {             await averylongrunningproccess();         });          pbimage.image = properties.resources.remove;          gettbox.wait();          pbimage.image = properties.resources.insert;          btnnext.visible = true;          tmrdeviceinsert.enabled = true;         tmrdeviceinsert.start();     }   private void tmrdeviceinsert_tick(object sender, eventargs e)     {         next();     } 

i change image of picture box inform user progress of long running process. part works fine, button doesn't show, , timer never starts. i've stepped through code, , can confirm running without problems, makes more baffling. ideas causing issue?

task.run pushing cpu-intensive work off ui thread. since you're calling asynchronous method, suspect it's not cpu-intensive.

so, can use async , await:

private async void ucdeviceinsert_load(object sender, eventargs e) {   pbimage.image = properties.resources.remove;   await averylongrunningproccess();   pbimage.image = properties.resources.insert;   btnnext.visible = true;   tmrdeviceinsert.enabled = true;   tmrdeviceinsert.start(); } 

note @ await, ui shown , user can interact (that's point).