public ActionResult Create()
{
 var instructor = new Instructor();
 instructor.Courses = new List<Course>();
 PopulateAssignedCourseData(instructor);
 return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include =
"LastName,FirstMidName,HireDate,OfficeAssignment" )]Instructor instructor,
string[] selectedCourses)
{
 if (selectedCourses != null)
 {
 instructor.Courses = new List<Course>();
 foreach (var course in selectedCourses)
 {
 var courseToAdd = db.Courses.Find(int.Parse(course));
 instructor.Courses.Add(courseToAdd);
 }
 }
 if (ModelState.IsValid)
 {
 db.Instructors.Add(instructor);
 db.SaveChanges();
 return RedirectToAction("Index");
 }
 PopulateAssignedCourseData(instructor);
 return View(instructor);
}