Controlling the WCF XmlSerializer

protected override void OnWriteMessage(XmlDictionaryWriter writer)
    {
        ...
    }

    protected override void OnWriteStartEnvelope(XmlDictionaryWriter writer)
    {
        ...
    }

    protected override void OnWriteStartBody(XmlDictionaryWriter writer)
    {
        ...
    }

    protected override void OnWriteBodyContents(XmlDictionaryWriter writer)
    {
        ...
    }