ImgurService.cs

public class ImgurService : IDisposable
    {
        private HttpClient _client;
        public string ClientID { get; private set; }

        public ImgurService(string clientId)
        {
            ClientID = clientId;
            InitializeHttpClient();
        }

        public void InitializeHttpClient()
        {
            _client = new HttpClient();
            _client.BaseAddress = new Uri("https://api.imgur.com/3/");
            _client.DefaultRequestHeaders.Add(
                "Authorization", "Client-ID " + ClientID);
        }

        public async Task<string> UploadImageAsync(byte[] imageData)
        {
            var content = new ByteArrayContent(imageData);

            var response = await _client.PostAsync("image", content);
            response.EnsureSuccessStatusCode();
            var responseContent = await response.Content.ReadAsStringAsync();

            var model = new JavaScriptSerializer().Deserialize<dynamic>(responseContent);
            var imageLink = model["data"]["link"];

            return imageLink;
        }

        public void Dispose()
        {
            _client.Dispose();
        }
    }