public IActionResult assignStudentCompany(employmentViewModel model)
        {
            int studentId   = int.Parse(model.selectedStudent);
            var studentcomp = _employRepo.GetAllEmploymentHistory().Where(sc => sc.CompID == model.compy_id && sc.ID == studentId).FirstOrDefault();

            if (studentcomp == null)
            {
                EmploymentHistory employment = new EmploymentHistory()
                {
                    CompID    = model.compy_id,
                    StudentId = studentId,
                    StartDate = model.StartDate,
                    //EndDate = model.EndDate
                };
                _employRepo.AddEmploymentHistory(employment);
                return(RedirectToAction("index"));
            }
            else
            {
                ModelState.AddModelError("duplicate", "Error in key vale");
                List <Student>      studentlist    = _student.GetAllStudent().ToList();
                employmentViewModel employmentView = new employmentViewModel()
                {
                    studentlist = studentlist
                };
                return(View(employmentView));
            }
        }