public ActionResult Create(TimeInterval timeinterval)
        {
            timeinterval.IntervalOwner = db.UserProfiles.Where(u => u.UserName == User.Identity.Name).First();

            if (ModelState.IsValid)
            {
                db.TimeIntervals.Add(timeinterval);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(timeinterval);
        }
 public ActionResult Edit(TimeInterval timeinterval)
 {
     if (ModelState.IsValid )
     {
         db.Entry(timeinterval).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(timeinterval);
 }