This is how I retrieved the file names :)
IStorageFolder dataFolder = await local.GetFolderAsync(App.ALL_PAGE_FOLDER);
IEnumerable<IStorageFile> files = await dataFolder.GetFilesAsync();
foreach (IStorageFile anyfile in files)
{
if (anyfile.Path.EndsWith(".png"))
{
var name = anyfile.Name;
}
}