cannot save changes of courses if remove in edit httppost

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Problem

when remove course then click submit not save changes although

it removed from client side by jquery

Details 

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

http://www.mediafire.com/download/3xs35gecmvkksj1/all_project.txt
code 

my code as following 

[HttpPost]  
        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 });  
                db.SaveChanges();  
            }  
        
            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; }  
    }  
}  


Answer