How to prevent page instances from being called more than 1 time (UWP)?

Question

.NET

I'm calling the transition to another page with the Frame.Navigate(). And if you tap on the button several times, then the program will open several instances of the page. Of course, I can put it right isEnabled = falseon the button, but this option is not the best, as I understand it. Actually a subject.

Answer 1

if (frame.CurrentSourcePageType != typeof(LALA) && typeof(LALA) != null)
{
 frame.Navigate(typeof(LALA));
}

Answer 2

This is the normal option. Turn off the button and turn it on when the download is complete.