// удаляем доступ всем
                        result.result_text = "";
                        result.HasUniqueRoleAssignments = item.HasUniqueRoleAssignments;

                        RoleAssignmentCollection rac = item.RoleAssignments;
                        clientContext.Load(
                                rac,
                                roleAssigned => roleAssigned.Include(
                                        ra => ra.Member,
                                        ra => ra.Member.Title,
                                        ra => ra.Member.LoginName,
                                        ra => ra.Member.PrincipalType
                                        )
                                );
                        clientContext.ExecuteQuery();

                        Principal Member;
                        foreach (RoleAssignment ra in rac)
                        {
                            Member = ra.Member;

                            if (Member.PrincipalType == PrincipalType.User)
                            {
                                existsUserForRemove = true;
                                ra.RoleDefinitionBindings.RemoveAll();
                                ra.Update();

                                result.result_text += $"{Member.LoginName} access start removed. ";
                            }
                        }
                        try
                        {
                            if (existsUserForRemove)
                            {
                                //item.BreakRoleInheritance(true, true);    // вернуть наследование
                                // выполним на сервере запрос удаления юзеров
                                clientContext.ExecuteQuery();
                                result.result_text += "all personal accesses removed;; ";
                            }
                            else
                            {
                                result.result_text += "not found personal access for removed;; ";
                            }

                            if (item.HasUniqueRoleAssignments)
                            {

                                result.result_text += $"HasUniqueRoleAssignments={item.HasUniqueRoleAssignments};; ";
                                item.ResetRoleInheritance();    // вернуть наследование
                                clientContext.ExecuteQuery();
                                result.result_text += "ResetRoleInheritance executed;; ";
                                clientContext.Load(item, l => l.HasUniqueRoleAssignments);  // прочитать признак заново
                                clientContext.ExecuteQuery();
                                result.HasUniqueRoleAssignments = item.HasUniqueRoleAssignments;
                                result.result_text += $"HasUniqueRoleAssignments={item.HasUniqueRoleAssignments};; ";

                            }
                            else
                            {
                                result.result_text += "not found access for removed";
                            }

                        }
                        catch (Exception err)
                        {
                            result.result_text = "all accesses removed";
                            result.error_text = 
                                $"SetFileAccess: Ошибка при удалении всех доступов к документу:  {err.Message} {err.InnerException} {err.ToString()}";
                            return false;
                        }
                        return true;

  item.ResetRoleInheritance();    // вернуть наследование
  clientContext.ExecuteQuery();