to Stephen

class TestObj : IDisposable
{
    private TaskCompletionSource<int> tcs;

    public TestObj()
    {
        tcs = new TaskCompletionSource<int>();
    }

    public void Dispose()
    {
        tcs.TrySetException(new AmbiguousMatchException());
        //tcs.TrySetCanceled();
    }
}

public partial class MainPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);

        for (int i = 0; i < 100000; i++)
        {
            using (var obj = new TestObj())
            {
            }
        }
    }
}