Logging the Lost Responses In WCF

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C#3.0

C#

ASP.NET

WCF

logging

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I am having a scenario in my WCF application where I need to log the requests into the database upon exception I have stored my request in a dictionary and used IsFault to check whether my request is fault, if it is fault than I have logged it into the database

 public static string key;
Dictionary<string , string> actionToReplyAction;
String value  = "";
public NLog.Logger _logger = NLog.LogManager.GetCurrentClassLogger();

public void AfterReceiveReply(ref Message reply, object correlationState)        
{
    if (reply.IsFault)
    {
        string requestAction = (string)correlationState;
        _logger.Debug("Request  :::: " + key);
        _logger.Debug("Response :::: " + reply.ToString());
    }
}

public object BeforeSendrequest(ref Message request, IClientChannel channel)
{
    key = request.ToString();

    return null;
}

How can I log the Request whenever the response is Lost. I am new to WCF: if you could give me sample code it would be helpful.