public IActionResult GetAllCourseSections(int courseId)
 {
     if (courseId > 0)
     {
         IEnumerable <CourseSection> sections = _db.AllCourseSectionsInSpecificCourse(courseId);
         if (sections != null)
         {
             return(Ok(sections));
         }
     }
     return(BadRequest("Something went wrong"));
 }