private static void TPT()
        {
            using (var context = new InheritanceContext())
            {
                var lkw = new LKW {
                    Farbe = "Rot", MaxLadung = 13000
                };
                var pkw = new PKW {
                    Farbe = "Blau", Sitzplaetze = 5
                };

                context.Fahrzeuge.Add(lkw);
                context.Fahrzeuge.Add(pkw);

                context.SaveChanges();
            }
        }
        private static void TPC()
        {
            using (var context = new InheritanceContext())
            {
                var clock = new Clock {
                    Id = 1, Name = "Wanduhr", Time = DateTime.Now
                };
                var desk = new Desk {
                    Id = 2, Name = "Schreibtisch", Material = "Holz"
                };

                context.Products.Add(clock);
                context.Products.Add(desk);

                context.SaveChanges();
            }
        }
        private static void TPH()
        {
            using (var context = new InheritanceContext())
            {
                var employee = new Employee {
                    Name = "Sepp", Salery = 3000
                };
                var customer = new Customer {
                    Name = "Lisa", Adress = "Musterstraße 1"
                };

                context.People.Add(employee);
                context.People.Add(customer);

                context.SaveChanges();
            }
        }