Update Using Entity Framework is not reflecting my DB table

I'm new in entity and wrote a function to update a particular field TStatus. Here is what I'm trying to execute:-

public ActionResult UpdateTStatus(int ICCID) {
        using (var db = new MyDBContext())
        {
            var result = db.INTERVIEW_AGENT_CALL_CENTERS.Where(g => g.Id == ICCID).FirstOrDefault();
            if (result != null)
            {
                result.TStatus= 10;
                db.Entry(result).State = EntityState.Modified;
                db.SaveChanges();
                return Content("Result = "+result.TStatus);

            }
            else
            {
                return Content("An Error");
            }
        }
        return View();
    }

Whenever I'm executing the method and run a direct query on SQL Server I'm getting the old value of TStatus.