public static async void ResumeWinRtApp(string appUserModelId)

{

    try

    {

        IList<AppDiagnosticInfo> infos = await AppDiagnosticInfo.RequestInfoForAppAsync(appUserModelId);

        if (infos != null && infos.Count > 0)

        {

            IList<AppResourceGroupInfo> resourceInfos = infos[0].GetResourceGroups();

            await resourceInfos[0].StartResumeAsync();

        }

    }

    catch (Exception ex)

    {

        Debug.WriteLine(ex.Message);

    }

}