public async static Task<int> GetFreeSpace()

 {

     StorageFolder localFolder = ApplicationData.Current.LocalFolder;

     var properties = await localFolder.GetBasicPropertiesAsync();

     var filteredProperties = await properties.RetrievePropertiesAsync(new[] { "System.FreeSpace" });

     string freeSpace = filteredProperties["System.FreeSpace"].ToString();

     ulong size;

     int mb = ;

     if (ulong.TryParse(freeSpace, out size))

         mb = (int)(size / ( * ));

     return mb;

 }

auto folder = Windows::Storage::ApplicationData::Current->LocalFolder;

auto outputText = std::make_shared<String^>("Space: " + folder->Name);

// Get basic properties

create_task(folder->GetBasicPropertiesAsync()).then([this, outputText](task<BasicProperties^> task)

{

    try

    {

        BasicProperties^ basicProperties = task.get();

        *outputText += "\nFile size: " + basicProperties->Size.ToString() + " bytes";

    }

    catch (COMException^ ex)

    {

        //rootPage->HandleFileNotFoundException(ex);

    }

}).then([this, folder]()

{

    // Get extra properties

    auto propertiesName = ref new Vector<String^>();

    propertiesName->Append(L"System.FreeSpace");

    propertiesName->Append(L"System.Capacity");

    return folder->Properties->RetrievePropertiesAsync(propertiesName);

}).then([this, outputText](IMap<String^, Object^>^ extraProperties)

{

    auto propValue = extraProperties->Lookup(L"System.FreeSpace");

    if (propValue != nullptr)

    {

        *outputText += "\n FreeSpace: " + propValue;

    }

    auto propValue2 = extraProperties->Lookup(L"System.Capacity");

    if (propValue2 != nullptr)

    {

        *outputText += "\n Capacity: " + propValue2;

    }

});