update an umbraco node with a class

updateNode.cs

using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Mvc;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using Umbraco.Core;
using Umbraco.Core.Logging;
using Umbraco.Core.Models;
using Umbraco.Core.Services;
using Umbraco.Web;
using Umbraco.Web.Mvc;

namespace bbatybarr.App_Code
{
    public class votenowSurfaceController : SurfaceController
    {
        [HttpPost]
        public ActionResult castVote()
        {
            var contentService = ApplicationContext.Current.Services.ContentService;
            var homeNode = contentService.GetRootContent().FirstOrDefault();
		    var upDoc = contentService.GetById(Convert.ToInt32(homeNode.Id));
		    var getInfo = Umbraco.TypedContent(Convert.ToInt32(homeNode.Id));	
		    int curVotes = getInfo.HasValue("votes") ? getInfo.GetPropertyValue<int>("votes") : 0 ;
            int newVote = curVotes + 1;
            upDoc.SetValue("votes", newVote);
            contentService.SaveAndPublish(upDoc);
            return Content(newVote.ToString());
        }
    }
}