// no screen locking by clicking it
private async void Button_Click_1(object sender, RoutedEventArgs e)
{
var slowCalculations = new SlowCalculations();
var s = await Task.Run(() => slowCalculations.GetData());
txtCalculatedData.Text = s;
}
// this method will cause screen to lock
private void Button_Click(object sender, RoutedEventArgs e)
{
var slowCalculations = new SlowCalculations();
var s = slowCalculations.GetData();
txtCalculatedData.Text = s;
}