Data not deleting from parent child table

Question

Hello Team,

Please am trying to delete data from two table but is not working, kindly assist.

 public ActionResult DeleteStaff(int StaffId, int CompanyId)
        {
            try
            {
                ASPNETMASTERPOSTEntities db = new ASPNETMASTERPOSTEntities();
               var company = db.tblCompany.Where(x => x.CompanyId == CompanyId ).FirstOrDefault();
                var Staff = db.tblStaffs.Where(x => x.StaffId == StaffId ).FirstOrDefault();

db.tblCompany.Remove(company);
                db.tblStaffs.Remove(Staff);
                db.SaveChanges();
                return Json(true, JsonRequestBehavior.AllowGet);
            }
            catch (Exception)
            {
                return Json(false, JsonRequestBehavior.AllowGet);
            }

        }