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public ActionResult Index(string search="")
        {
            var model = db.Restaurants
                    .Where(r => r.Name.Contains(search))
                    .OrderByDescending(r => r.Reviews.Average(rr => rr.Rating))
                    .Select(r => new RestaurantViewModel { ID = r.ID, Name = r.Name, Country = r.Country, City = r.City, NumReviews = r.Reviews.Count })
                    .Take(10);
            if (Request.IsAjaxRequest())
            {
                return PartialView("_Restaurants",model);
            }
            else
            {
                return View(model);
            }
        }

<form method="get" action=@Url.Action("Index") data-otf-ajax="true" data-otf-target="#restaurantList" >
    <input type="text" name="search" value=""/>
    <input type="submit" value="Search by name" />
</form>