public static VkOAuthAccessJSON GetAccessToken(string code)
        {
            WebRequest request = WebRequest.Create(VkOAuthData.GetRequestForAccessToken(code));

            WebResponse response = request.GetResponse();

            using (Stream dataStream = response.GetResponseStream())
            {
                StreamReader reader = new StreamReader(dataStream);

                string responseFromServer = reader.ReadToEnd();

                VkOAuthAccessJSON responseData = JsonConvert.DeserializeObject <VkOAuthAccessJSON>(responseFromServer);
                return(responseData);
            }
        }
        public static RootVkFriends GetUserFriends(string userId, string accessToken)
        {
            WebRequest request = WebRequest.Create(VkOAuthData.GetRequestForUserFrineds(userId, accessToken));

            WebResponse response = request.GetResponse();

            using (Stream dataStream = response.GetResponseStream())
            {
                StreamReader reader = new StreamReader(dataStream);

                string responseFromServer = reader.ReadToEnd();

                RootVkFriends responseData = JsonConvert.DeserializeObject <RootVkFriends>(responseFromServer);
                return(responseData);
            }
        }