Do you know where it is in the video? Are they not talking about something like this?

    public bool IsOpen{get; private set;}
    public void Open(){
        try{
            // do some complex work
            this.IsOpen = true;
        }
        catch{
            this.IsOpen = false;
        }
    }
    public void Close(){
        // do some other work
        this.IsOpen = false;
    }