How to remove courses store in ids in edit post controller

image link for details of my needs

In edit http post i need to remove courses stored in ids variable

note i need remove courses selected not edit

in jquery i store values of removed courses in ids variable

suppose i removed photoshop and flash it will store value of 3,4 in ids variable

below code when click remove it save values of courses removed in variable ids as array

$("#tb").on("click", ".r", function () {
var ids = [];
var i = 0;
$(".remove").each(function () {
ids[i] = $(this).val();
for (var k = 0; k < ids.length; k++) {

i show courses per employee from table EmployeeCourse in edit get as following

var index = 0;
url: "/Employeedata/getcoursesbyempid",
success: function (res) {
$.each(res, function (i, e) {
$("#tb").append("<tr><td><input type = 'hidden' name='empcourses[" + index + "].CourseId' value='" + e.Id + "'/></td><td>" + e.CourseName + "</td><td><input type='button' value='remove' class='r'/></td></tr>")
public JsonResult getcoursesbyempid(int x)
db.Configuration.ProxyCreationEnabled = false;
var data = db.EmployeeCourses.Where(a => a.EmployeeId == x).Join(db.Courses, a => a.CourseId, b => b.Id, (a, b) => new { Id = a.CourseId, CourseName = b.CourseName });
return Json(data, JsonRequestBehavior.AllowGet);
my model using as following

public class Cusomemp2
public int Id { get; set; }
public string Name { get; set; }
public List<EmployeeCourse> empcourses { get; set; }

when remove courses in edit HTTPPOST what i write here

public ActionResult Edit(Cusomemp2 custom)
//what i write to remove courses saved in ids from table EmployeeCourse
return View();

see image above for details