Fetch Image from Server in Xamarin Android

I am trying to fetch an image from server and to display on ImageView control in my Xamarin Android. I have tried to method for doing it but none of them is working. What may be the reason? Please help me

METHOD -I

public void testWCF()
        {   
            WebClient web = new WebClient();
            web.DownloadDataCompleted += new     DownloadDataCompletedEventHandler(web_DownloadDataCompleted);
            web.DownloadDataAsync(new     Uri(@"http://ift.tt/191hiVP"));

        }

    void web_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
    {

        if (e.Error != null)
        {
            RunOnUiThread(() =>
                Toast.MakeText(this,"ritesh your error is "+ e.Error.Message, ToastLength.Long).Show());
        }
        else
        {

            Bitmap bm = BitmapFactory.DecodeByteArray(e.Result, 0, e.Result.Length);

            RunOnUiThread(() =>
                {
                    ImageView imgView = FindViewById<ImageView>(Resource.Id.imageView1);
                    imgView.SetImageBitmap(bm);
                });
        }
    }

METHOD-II

public async void testWCF2()
        {
            var imgView = FindViewById<ImageView>(Resource.Id.imageView1);
            using(var bm = await GetImageFromUrl(@"http://ift.tt/191hiVP"))    
                imgView.SetImageBitmap(bm);

        }

    private async Task<Bitmap> GetImageFromUrl(string url)
    {
        using(var client = new HttpClient())
        {
            var msg = await client.GetAsync(url);
            if (msg.IsSuccessStatusCode)
            {
                using(var stream = await msg.Content.ReadAsStreamAsync())
                {
                    var bitmap = await BitmapFactory.DecodeStreamAsync(stream);
                    return bitmap;
                }
            }
        }
        return null;
    }