//Create student in disconnected modeStudent newStudent = new Student() { StudentName = "New Single Student" };            //Assign new standard to student entitynewStudent.Standard = new Standard() { StandardName = "New Standard" };            //add new course with new teacher into student.coursesnewStudent.Courses.Add(new Course() { CourseName = "New Course for single student", Teacher = new Teacher() { TeacherName = "New Teacher" } });using (var context = new SchoolDBEntities()){    context.Students.Add(newStudent);    context.SaveChanges();    Console.WriteLine("New Student Entity has been added with new StudentId= " + newStudent.StudentID.ToString());    Console.WriteLine("New Standard Entity has been added with new StandardId= " + newStudent.StandardId.ToString());    Console.WriteLine("New Course Entity has been added with new CourseId= " + newStudent.Courses.ElementAt(0).CourseId.ToString());    Console.WriteLine("New Teacher Entity has been added with new TeacherId= " + newStudent.Courses.ElementAt(0).TeacherId.ToString());}