Implementing Queueing in WCF - wcf

Question

I have a simple WCF service which creates a directory at a location specified as a param.
The service is hosted as a Windows service and runs under the administrator account.
The InstanceContextMode is Single and so is the Concurrency.
The method returns a string of the directory location after creating it.
A client is accessing this service from another computer using ASP.NET.
He has a use case, he clicks the button on the page multiple times in a matter of few seconds, like clicking it 5 times in 2 seconds. What's happening is that the service creates only 2 or 3 folders not all 5.
I know that there is a default queueing mechanism in WCF and for my service it's either not working or I haven't written it to use that mechanism.
How do I go about solving this problem.
Here's the ASP.NET code for button click
protected void Button1_Click(object sender, EventArgs e)
{
ClientClass objClientClass = new ClientClass();
string returnValue = string.Empty;
Random random = new Random();
string uid = random.Next().ToString();
returnValue = objClientClass.StartWorkflow(uid);
Label1.Text = returnValue;
}
Here's the app.config of the host:
<configuration>
<system.diagnostics>
<sources>
<source name="System.ServiceModel"
switchValue="All"
propagateActivity="true">
<listeners>
<add name="traceListener" />
</listeners>
</source>
<source name="System.ServiceModel.MessageLogging"
switchValue="All"
propagateActivity="true">
<listeners>
<add name="traceListener" />
</listeners>
</source>
</sources>
<sharedListeners>
<add name="traceListener"
type="System.Diagnostics.XmlWriterTraceListener"
initializeData="Traces.svclog" />
</sharedListeners>
</system.diagnostics>
<system.web>
<compilation debug="true"></compilation>
</system.web>
<system.serviceModel>
<diagnostics>
<messageLogging logEntireMessage="true"
logMessagesAtServiceLevel="false"
logMessagesAtTransportLevel="false"
logMalformedMessages="true"
maxMessagesToLog="5000"
maxSizeOfMessageToLog="2000">
</messageLogging>
</diagnostics>
<behaviors>
<serviceBehaviors>
<behavior name="NewBehavior">
<serviceMetadata httpGetEnabled="true" />
<serviceThrottling maxConcurrentCalls="1" maxConcurrentSessions="5" maxConcurrentInstances="5" />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="NewBehavior" name="Utilities.WS.SampleWebService.Jobs">
<endpoint address="" binding="basicHttpBinding" bindingConfiguration=""
contract="Utilities.WS.SampleWebService.IJobs" />
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
<host>
<baseAddresses>
<add baseAddress="http://00.00.000.00:8732/Utilities.WS.SampleWebService.Jobs" />
</baseAddresses>
</host>
</service>
</services>
</system.serviceModel>
</configuration>
Regards.

Answer 1

STEP 1. ping from client (Which is server side ASP.NET code, not the browser), can it reach the machine hosting the WCF service? Firewall sitting between your webserver and where WCF is hosted?
STEP 2. SVC log
Setup svclog from your config file,
<configuration>
<system.diagnostics>
<sources>
<source name="System.ServiceModel"
switchValue="Information, ActivityTracing"
propagateActivity="true">
<listeners>
<add name="traceListener"
type="System.Diagnostics.XmlWriterTraceListener"
initializeData= "c:\log\Traces.svclog" />
</listeners>
</source>
</sources>
</system.diagnostics>
</configuration>
Then use SvcTraceViewer from command prompt - look for red.
STEP 3. Add some more logging to your operation and see if anything actually executed
http://msdn.microsoft.com/en-us/library/ms732023(v=vs.110).aspx