Update the ListBox ItemsSource, whether will card interface, even if is to get the data asynchronously? Because be interact with the UI, are you?
I now is very card, as follows:

 
Private async void Refresh () 
{
Await Task. Run (()=& gt; 
{
. 
.//data computing 
Itemsource=new ObservableCollection (fronts);//this step card 
}); 
} 

Is there any way to solve this problem