Question

Could it be that the ‘completed’ event handler won’t be called due to resource freeing by the GC?

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();
    }

Answer 1

Yes, that is possible since you are losing all references to client once the function returns.

client.StartVideoCompleted += client_StartVideoCompleted; ends up holding a reference to the object with the client_StartVideoCompleted function but that is not reciprocated. You’ll need to keep a reference to the created client somehow.