c#中的事件注册范围

是否可能由于GC释放资源而不会调用'已完成'事件处理程序?

public void StartVideo(WerCamera camera)
    {
        Credential creadential = new Credential() { Email = CurrentUser.Email, Password = CurrentUser.Password, SessionNumber = SessionNumber};
        CommandsClient client = new CommandsClient();
        client.StartVideoCompleted += client_StartVideoCompleted;
        client.StartVideoAsync(int.Parse(camera.Id), creadential, ClientInfo);
        client.CloseAsync();
    }