Windows 8 Metro: C++/CX vs. C#

// C#
var picker = new FileOpenPicker();
var file = await picker.PickSingleFileAsync();
var stm = await file.OpenReadAsync();
// use the stream, luke!

// C++
auto picker = ref new FileOpenPicker();
create_task( picker->PickSingleFileAsync() ).then([](StorageFile^ file) {
    create_task( file->OpenReadAsync() ).then([](IRandomAccessStreamWithContentType^ stm) {
        // use the stream, luke...
    });
});

// Javascript
var picker = new FileOpenPicker();
picker.pickSingleFileAsync().then(function(var file) {
    file.openReadAsync().then(function(var stm) {
        // use the stream, luke...
    });
});