ValueConverter URL to Image

[ValueConversion(typeof(String), typeof(BitmapImage))]
    public class UriToImageConv : IValueConverter
    {

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || value.ToString() == "")
                return null;

            RestClient client = new RestClient();
            var request = new RestRequest(value.ToString(), Method.GET);
            try
            {
                string username = MySettings.Get("username");
                string password = DataProtector.DecryptData(MySettings.Get("password"));

                if (string.IsNullOrWhiteSpace(username) || string.IsNullOrWhiteSpace(password))
                    return null;

                HttpBasicAuthenticator user = new HttpBasicAuthenticator(username, password);
                client.Authenticator = user;

                var response = client.Execute(request);
                return LoadImage(response.RawBytes);


            }
            catch (Exception ex1)
            {
                MessageBox.Show("exception: " + ex1);
            }

            return null;


        }
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {

            throw new NotImplementedException();
        }


        private static BitmapImage LoadImage(byte[] imageData)
        {

            try
            {
                if (imageData == null || imageData.Length == 0) return null;
                var image = new BitmapImage();
                using (var mem = new MemoryStream(imageData))
                {
                    mem.Position = 0;
                    image.BeginInit();
                    image.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
                    image.CacheOption = BitmapCacheOption.OnLoad;
                    image.UriSource = null;
                    image.StreamSource = mem;
                    image.EndInit();
                }
                image.Freeze();
                return image;
            }
            catch { }
            return null;

        }

    }