How to get user data from vk.com

gistfile1.cs

// Instructions: http://goo.gl/2JIC2
static void Main(string[] args)
{
    var apiUrl = "http://api.vk.com/api.php";
    var dict = new Dictionary<string, string>();
    dict["api_id"] = "123456"; // Change this!
    dict["v"] = "3.0";
    dict["format"] = "JSON";
    var api_secret = "1JH6TCDi8VBGyxQAZQ1Q"; // Change this!

    dict["method"] = "getProfiles";
    dict["uids"] = "4780160";
    dict["fields"] = "photo,nickname,screen_name,birthdate";
    var keys = from k in dict.Keys orderby k select k;
    var signStringItems = from k in keys select string.Format("{0}={1}", k, dict[k]);
    var signString = string.Join(string.Empty, signStringItems.ToArray()) + api_secret;

    var md5Hasher = MD5.Create();
    var md5Data = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(signString));
    var md5Chars = from b in md5Data select b.ToString("x2");
    var md5String = string.Join(string.Empty, md5Chars.ToArray());

    dict["sig"] = md5String;

    Func<KeyValuePair<string, string>, string> formatParamValue = kv => 
        string.Format("{0}={1}", kv.Key, Uri.EscapeDataString(kv.Value));

    var queryItems = from kv in dict select formatParamValue(kv);
    var queryString = string.Join("&", queryItems.ToArray());
    var requestUrl = string.Format("{0}?{1}", apiUrl, queryString);
    var responseJson = (string)null;
    using (var browser = new WebClient())
    using (var responseData = browser.OpenRead(requestUrl))
    using (var responseReader = new StreamReader(responseData))
    {
        responseJson = responseReader.ReadToEnd();
    }

    var jsonUtil = new JavaScriptSerializer();
    var user = jsonUtil.Deserialize<VKResponse>(responseJson).response[0];
}

class VKResponse 
{
    public VKUserInfo[] response { get; set; }
}

class VKUserInfo
{
    public string uid { get; set; }

    public string first_name { get; set; }

    public string last_name { get; set; }

    public string photo { get; set; }

    public string birthday { get; set; }

    public string nickname { get; set; }

    public string screen_name { get; set; }
}