ASP.NET MVC Chart Control

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ChartApplication;
using ChartApplication.Models;
using ChartApplication.Services;

namespace ChartApplication.Controllers
{
    public class ResultController : Controller
    {
        private readonly IResultService _resultService;
        public ResultController()
        {
            _resultService = new TheService().ResultService;
        }
        //
        // GET: /People/

        public ActionResult Index()
        {
            return View();
        }

        //
        // GET: /People/Add/5

        [HttpGet]
        public ActionResult Save(string id)
        {
            if (!string.IsNullOrEmpty(id))
            {
                ResultModel model = _resultService.GetResult(id);
            }
            IList<ResultModel> results = _resultService.GetResults();
            ViewData["results"] = results;
            return View("Save");
        }
        [HttpPost]
        public ActionResult Save(ResultModel result)
        {
           // if (String.IsNullOrEmpty(result.ID)) throw new ArgumentException("Value cannot be null or empty.", "ID");
           // if (String.IsNullOrEmpty(result.GPA)) throw new ArgumentException("Value cannot be null or empty.", "GPA");
            if (ModelState.IsValid)
            {
                if (result != null)
                {
                    _resultService.SaveResult(result);
                }
            }
            else
            {
                ModelState.AddModelError("", "Invlid");
            }
            IList<ResultModel> results = _resultService.GetResults();
            ViewData["results"] = results;
            return View();
        }
        public ActionResult Remove(string id)
        {
            if (!string.IsNullOrEmpty(id))
            {
                _resultService.RemoveResult(id);
            }
            IList<ResultModel> results = _resultService.GetResults();
            ViewData["results"] = results;
            return View("Save");            
        }
    }
}