desarrollar una Web App en ASP.NET que permita el ingreso de una temperatura en Fahrenheit y convertirla a Celsius

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using Prueba.Models;

namespace Prueba.Controllers
{
    public class TempreaturasController : Controller
    {
        private ApplicationDbContext db = new ApplicationDbContext();

        // GET: Tempreaturas
        public ActionResult Index()
        {
            return View(db.Tempreaturas.ToList());
        }

        // GET: Tempreaturas/Details/5
        public ActionResult Details(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Tempreatura tempreatura = db.Tempreaturas.Find(id);
            if (tempreatura == null)
            {
                return HttpNotFound();
            }
            return View(temp