protected void Register_Click(object sender, EventArgs e)
    {
          Models.User p = Models.User.Register(TxtName.Text, TxtUsername.Text, TxtPass.Text);

    }

public static User Register(string fn, string un, string pass)
    {
        User p = new User()
        {
            Name = fn,
            Username = un,
            Password = pass,
        };
        return p = UserCommunicate.Register(p);
    }

public static User Register(User player)
    {
        var request = HttpWebRequest.Create(String.Format(URL + "register?username={0}&password={1},Name={2}", player.Username, player.Password, player.Name));// "/save" or "/update"
        request.ContentType = "application/json"; // tell the API we want Json returned
        request.Method = "POST";

        try
        {
            using (var streamWriter = new StreamWriter(request.GetRequestStream()))
            {
                string JSONPost = JsonConvert.SerializeObject(player, Formatting.None,
                    new JsonSerializerSettings()
                    {
                        ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                    });

                streamWriter.Write(JSONPost);
                streamWriter.Flush();
                streamWriter.Close();
            }
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                if (response.StatusCode != HttpStatusCode.OK)
                {
                    return null;
                }
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    return JsonConvert.DeserializeObject<User>(reader.ReadToEnd());
                }
            }
        }
        catch (Exception ex)
        {
            return null;
        }
    }

using (TestDBDataContext tdb = new TestDBDataContext())
        {
            if (tdb.UserTables.Where(User => User.Username == username).Count() <= 0)
            {
                UserTable p = new UserTable()
                {
                    Name = Name,
                    Username = username,
                    Password = password,
                };

                    tdb.UserTables.InsertOnSubmit(p);
                try
                {
                    tdb.SubmitChanges();
                    return new Models.User(p);
                }