[HttpPost, AdminAuthenticated(AdminPermission.ManageGroups)]
        [SwallowNsbTimeoutAsCompletionResult]
        public void BatchAddUsersAsync(Guid id, List<string> usernames, bool? sendemail) {
            Command<AddMembersToLocalGroup>.Message(
                m => {
                    m.GroupId = id;
                    m.Usernames = usernames;
                    m.OrganisationId = Session.AdminOrgId();
                    m.SendConfimrationEmail = Convert.ToBoolean(sendemail);
                }).AsCurrentAdminUser().Send(this.AsyncManager);
        }

        [SwallowNsbTimeoutAsCompletionResult]
        public ActionResult BatchAddUsersCompleted(CompletionResult completionResult) {
            var command = completionResult.State as AddMembersToLocalGroup;
            return this.View("AddMemberQueuedConfirmation", command.GroupId);
        }