public async void GetAAID()
        {
            HmsInstanceId     hmsInstanceId = HmsInstanceId.GetInstance(this);
            Task <AAIDResult> idTask        = hmsInstanceId.GetAAIDAsync();
            var result = await idTask;

            if (idTask.IsCompleted && idTask.Result != null)
            {
                txtResult.Text = "Your Id: " + result.Id;
                Console.WriteLine("AAID retrieved successfully: " + result.Id);
            }
            else
            {
                Console.WriteLine("AAID retrieved failed: " + idTask.Result);
            }
        }