/*
* when user submit one of 4 answer the function called
*/
private void SubmitAnswer(object sender, RoutedEventArgs e)
{
var answer = sender as Button;
SubmitAnswerRequest submitAnswerRequest = new SubmitAnswerRequest(helper.get_answer_id(answer.Name));
var json = new JavaScriptSerializer().Serialize(submitAnswerRequest);
string request = Constants.SUBMIT_ANSWER_ID.ToString() + json.Length.ToString() + json;
string response = helper.SendAndRecive(request);
SubmitAnswerResponse submitAnswerResponse = new JavaScriptSerializer().Deserialize <SubmitAnswerResponse>(response);
if (submitAnswerResponse.is_right)
{
answer.Foreground = Brushes.Green;
}
else
{
answer.Foreground = Brushes.Red;
}
set_question();
}