Fórum Fazer delete com join no linq #493867

'System.Data.Entity.DbSet<Ruptura.Models.Ruptura>' does not contain a definition for 'DeleteAllOnSubmit' and no extension method 'DeleteAllOnSubmit' accepting a first argument of type 'System.Data.Entity.DbSet<Ruptura.Models.Ruptura>' could be found (are you missing a using directive or an assembly reference?)

var monta_arvore = (from rup in db.Ruptura
                                    join ap in db.Apresentacao on rup.Codigo_Apresentacao equals (ap.Codigo_Apresentacao)
                                    join mo in db.Motivo on rup.IDMotivo equals (mo.IDMotivo)
                                    join pdv in db.PDV on rup.CodigoPDV equals (pdv.CodigoPDV)

                                    where rup.IDMotivo != _idmotivo

                                    //group rup by new { rup.IDRuptura} into gr

                                    select new
                                    {
                                        rup.IDRuptura,
                                        rup.DataRuptura,
                                        rup.IDMotivo,
                                        rup.Motivo.Motivo1,
                                        rup.IDOrigem,
                                        rup.CodigoPDV,
                                        rup.PDV.UF,
                                        pdv.Cidade,
                                        CnpjDescricao = pdv.Cnpj + " - " + pdv.Descricao,
                                        rup.Codigo_Apresentacao,
                                        ap.Unidade_Negocio,
                                        ap.Codigo_Unidade_Negocio,
                                        ap.Franquia,
                                        ap.Familia,
                                        ap.Descricao
                                    }).ToList().OrderBy(r => r.IDMotivo);

                foreach (var item in monta_arvore)
                {
                    db.DeleteAllOnSubmit(item); ==> Aqui dá o erro
                }