public ActionResult DetailCourse(string id)
        {
            try
            {
                Guid degID                      = Guid.Parse(id);
                var  getDegreeProgram           = r.Degree_Program.Where(s => s.ProgramID == degID).Select(s => s).FirstOrDefault();
                var  specificLevel              = r.Levels.Where(s => s.LevelID == getDegreeProgram.LevelID).Select(s => s.Level_Name).FirstOrDefault();
                IEnumerable <Degree_Subject> ds = CoursesModel.getSubjectsRelatedToDegree(degID);

                ViewBag.level  = specificLevel;
                ViewBag.Degree = getDegreeProgram.Degree_ProgramName;

                return(View(ds));
            }
            catch (Exception)
            {
                return(RedirectToAction("ManageCourses"));
            }
        }