string url = "";

using (HttpClient client = new HttpClient())
{
    client.BaseAddress = new Uri(url);
    client.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

    var content = await client.GetStringAsync(url);
    return JsonConvert.DeserializeObject<Object>(content);
}