cannot save changes of courses if remove in edit httppost

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when remove course then click submit not save changes although

it removed from client side by jquery


in edit view for every employee i need to do changes by remove or add new courses for employee

if i add new courses then click submit button it save what i do but if i remove course from courses then click submit it will not save courses i removed so that i need to check what is wrong in my code my code working without any problem  but only have problem i cannot save courses removed in database in employeecourse table when click submit employeecourse table have Id,EmployeeId,CourseId jquery remove client side attached with my question image describe what i need as following

cannot save changes of courses if remove in edit httppost link to my code to all project as following

my code as following 

        public ActionResult Edit(EditEmployeeVm model)  
            var emp = db.Employees.FirstOrDefault(f => f.Id == model.Id);  
            foreach (var couseid in model.CourseIds)  
                db.EmployeeCourses.Add(new EmployeeCourse { CourseId = couseid, EmployeeId = emp.Id });  
            return View();  
my(custom model) view model using for that  
 public class EditEmployeeVm  
        public int Id { setget; }  
        public List<SelectListItem> Courses { getset; }  
        public int[] CourseIds { setget; }  
        public List<CourseVm> ExistingCourses { setget; }  
    public class CourseVm  
        public int Id { setget; }  
        public string Name { setget; }