/ Problem 1.    Show Data from Related Tables
            Console.WriteLine("List ads (with N+1 query problem):");
            var ads = new List<string>();
            var startTime = DateTime.Now;
            var context = new AdsEntities();
            foreach (var ad in context.Ads)
            {
                ads.Add(string.Format("Title: {0}, Status: {1}, Category: {2}, Town: {3}, User: {4}",
                    ad.Title, ad.AdStatus.Status, ad.Category, ad.TownId, ad.AspNetUser.UserName));
            }

            Console.WriteLine("Time elapsed: {0}", DateTime.Now - startTime);
            Console.WriteLine(String.Join("\n", ads.Take(5)));
            Console.WriteLine("...");
            Console.WriteLine();