public ActionResult EditCourse(int courseId)
{
CourseInfo courseInfo = dao.GetCourseInfo(courseId);
courseInfo.CourseOptions =
dao.GetAllCourses()
.Where(c => c.CourseId != courseId)
.Select(c => new CourseOption {
CourseId = c.CourseId, CourseCode = c.CourseCode
})
.ToList();
courseInfo.PrereqIds = courseInfo.Prereqs?.Select(p => p.courseId).ToList();
return(View(courseInfo));
}