public ActionResult EditCourse(int id)
{
CourseVM course = courseBll.getCourseById(id);
List <CategoryVM> categories = courseBll.getAllCategories();
SelectList categsList = new SelectList(categories, "category_id", "category_name", course.category_id);
ViewBag.categsList = categsList;
List <servicesVM> services = serviceBll.getAllServices();
SelectList servicesList = new SelectList(services, "service_id", "service_name", course.service_id);
ViewBag.servicesList = servicesList;
List <instructorVM> instructors = InstructorBll.getAllIstructors();
SelectList instructorsList = new SelectList(instructors, "instructor_id", "instructor_name", course.instructor_id);
ViewBag.instructorsList = instructorsList;
ViewBag.activeState = course.isActive;
return(PartialView(course));
}