remove course from EmployeeCourse table when click save but

IF i have 3 courses for employee Michel

c# remove button

SQL remove button

asp.net remove button

save button

I need when click remove button for SQL course remove it by jquery from client side then when click save button remove it from EmployeeCourse table in database in sql server

i use this model

public class Cusomemp2
{
public int Id { get; set; }
public List empcourses { get; set; }
}

and when i need to retrieve courses for employee in edit view i use this code below

$.ajax({
url: "/Employeedata/getcoursesbyempid",
data:{x:$("#hid").val()},
success: function (res) {
$.each(res, function (i, e) {
$("#tb").append(" + index + "].CourseId' value='" + e.Id + "'/>" + e.CourseName + "")
index++;
});
}
})

 function retrieve data in  controller


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);  
       }  

so that i need after retrieve data in edit view do two task
remove course by jquery if iremoved sql
then remove the course from database in table EmployeeCourse
how i do that by code jquery and c# controller
EmployeeCourse table have three fields
Id,CourseId,EmployeeId
Course Table have 
Id,CourseName
1  c#
2 sql
3 asp.net
Employee Table
have Id,Name