YouGrade - Asp.NET MVC Multimedia Exam Suite

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using YouGrade.Model;
using AutoMapper;
using YouGrade.Dtos;

namespace YouGrade.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View(ExamManager.Instance.GetExam());
        }

        //public ActionResult About()
        //{
        //    return View();
        //}

        [HttpGet]
        public ActionResult GetQuestion()
        {
            var question = ExamManager.Instance.GetQuestion(); 
            return Json(question, JsonRequestBehavior.AllowGet);
        }

        [HttpPost]
        public ActionResult SaveAnswer(int questionId, string answers)
        {
            var question = ExamManager.Instance.GetQuestion();
            ExamManager.Instance.SaveAnswer(questionId, answers);
            return Json(questionId, JsonRequestBehavior.AllowGet);
        }

        [HttpGet]
        public ActionResult MoveToPreviousQuestion()
        {
            ExamManager.Instance.MoveToPreviousQuestion();
            return GetQuestion();
        }

        [HttpGet]
        public ActionResult MoveToNextQuestion()
        {
            ExamManager.Instance.MoveToNextQuestion();
            return GetQuestion();
        }

        [HttpGet]
        public ActionResult EndExam()
        {
            var result = ExamManager.Instance.EndExam();
            return Json(
                new { 
                    success = true,
                    result = result
                }, 
                JsonRequestBehavior.AllowGet);
        }
    }
}