public ActionResult Edit_Course(Course ob)
        {
            //ModelState.Remove("CourseTypeID");
            //ModelState.Remove("Teaching_Hours_Lecture");
            //ModelState.Remove("Teching_Hours_Tutorial");
            //ModelState.Remove("TeachingHours_Practical");
            //ModelState.Remove("Midterm");
            //ModelState.Remove("Year_Work_Grades_O");
            //ModelState.Remove("Year_Work_Grades_PE");
            //ModelState.Remove("Year_Work_Grades_G");
            //ModelState.Remove("CurriculumID");

            if (ModelState.IsValid)
            {
                CourseBL.Update(ob);
                return(RedirectToAction("Course"));
            }
            else
            {
                return(View());
            }
        }