public IHttpActionResult Postreview(review review)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            //increment place rating and number of reviews
            int PlaceId = (int)review.PlaceId;
            place place = db.places.Find(PlaceId);
            if (place == null)
            {
                return BadRequest("Can't add review as no such place in database.");
            }
            else
            {
                //update place rating counts
                place.NumberReviews += 1;
                place.TotalRatings += (int)review.Rating;
                db.Entry(place).State = EntityState.Modified;

                db.reviews.Add(review);
                db.SaveChanges();

                return CreatedAtRoute("DefaultApi", new { id = review.Id }, review);
            }
        }
        public IHttpActionResult Putreview(int id, review review)
        {
            if (!ModelState.IsValid)
             {
                return BadRequest(ModelState);
             }

             if (id != review.Id)
             {
                return BadRequest();

             }

             review SelectedReview = db.reviews.Find(id);
             place place = db.places.Find(review.PlaceId);

             int NewRating = (int)review.Rating;
             int OldRating = (int)SelectedReview.Rating;
             place.TotalRatings -= OldRating;
             place.TotalRatings += NewRating;
             SelectedReview.Headline = review.Headline;
             SelectedReview.Date = review.Date;
             SelectedReview.Rating = review.Rating;
             SelectedReview.ReviewText = review.ReviewText;

             try
             {
                 db.SaveChanges();
             }
             catch (DbUpdateConcurrencyException)
             {
                 if (!reviewExists(id))
                 {
                     return NotFound();
                 }
                 else
                 {
                    throw;
                 }
             }

             return StatusCode(HttpStatusCode.NoContent);
        }