static void PopulateDb(SchoolDBEntities context) { DateTime birthDate1 = DateTime.ParseExact("1997-07-21", "yyyy-MM-dd", CultureInfo.InvariantCulture); DateTime birthDate2 = DateTime.ParseExact("1993-12-01", "yyyy-MM-dd", CultureInfo.InvariantCulture); Address address = new Address("Hungary", "1234", "Budapest", "Macskakő út 5."); Student student = new Student("Ödön", "*****@*****.**", birthDate1, address); student.AddPhoneNumber("12345"); Address address2 = new Address("Hungary", "6789", "Budapest", "Harap u. 3."); Student student2 = new Student("Aladár", "*****@*****.**", birthDate2, address2); student2.AddPhoneNumber("67890"); Klass classBp2 = new Klass("Budapest 2016-2", CCLocation.KRAKOW); classBp2.AddStudent(student); classBp2.AddStudent(student2); context.Add(student); context.Add(classBp2); context.Add(student2); context.SaveChanges(); }