public async Task SearchAsync(string term, Action<ResultItemVm> callback)
{
var web = new Web<RootObject>();
web.ConfigureAuthHeader(Constants.AuthHeader);
var tasks = new List<Task>
{
web.GetFeedAsync(new Uri(string.Format(Constants.ApiArtistUri, term))).ContinueWith(
artists => callback(GetResult(artists.Result, ResourceProxy.GetLocalizedString("Artist"))), TaskScheduler.FromCurrentSynchronizationContext()),
web.GetFeedAsync(new Uri(string.Format(Constants.ApiAlbumUri, term))).ContinueWith(
albums => callback(GetResult(albums.Result, ResourceProxy.GetLocalizedString("Album"))), TaskScheduler.FromCurrentSynchronizationContext()),
web.GetFeedAsync(new Uri(string.Format(Constants.ApiLabelUri, term))).ContinueWith(
labels => callback(GetResult(labels.Result, ResourceProxy.GetLocalizedString("Label"))), TaskScheduler.FromCurrentSynchronizationContext())
};
await TaskEx.WhenAll(tasks);
}