static void RunExample() { using (var context = new EFRecipesEntities()) { var exDrug1 = new Experimental { Name = "Nanoxol", PrincipalResearcher = "Dr. Susan James" }; var exDrug2 = new Experimental { Name = "Percosol", PrincipalResearcher = "Dr. Bill Minor" }; context.Drugs.AddObject(exDrug1); context.Drugs.AddObject(exDrug2); context.SaveChanges(); // Nanoxol just got approved! exDrug1.PromoteToMedicine(DateTime.Now, 19.99M, "Treatall"); context.Detach(exDrug1); // better not use this instance any longer } using (var context = new EFRecipesEntities()) { Console.WriteLine("Experimental Drugs"); foreach (var d in context.Drugs.OfType <Experimental>()) { Console.WriteLine("\t{0} ({1})", d.Name, d.PrincipalResearcher); } Console.WriteLine("Medicines"); foreach (var d in context.Drugs.OfType <Medicine>()) { Console.WriteLine("\t{0} Retails for {1}", d.Name, d.TargetPrice.Value.ToString("C")); } } Console.WriteLine("Press <enter> to continue..."); Console.ReadLine(); }