Update records using LINQ

Question

I need to set a value in a table for a subset of rows. In SQL, I would do this:

UPDATE dbo.Person SET is_default = 0 WHERE person_id = 5

Is

Answer 1

public ActionResult OrderDel(int id)
    {
        string a = Session["UserSession"].ToString();
        var s = (from test in ob.Order_Details where test.Email_ID_Fk == a && test.Order_ID == id select test).FirstOrDefault();
        s.Status = "Order Cancel By User";
        ob.SaveChanges();
        //foreach(var updter in s)
        //{
        //    updter.Status = "Order Cancel By User";
        //}


        return Json("Sucess", JsonRequestBehavior.AllowGet);
    }