IIS7.5/MVC Limit number of Managed Threads

Question

I'm trying to limit the number of managed threads permitted by an ASP.NET MVC application running under IIS7.5 on Windows Server 2008. I've attempted a number of different approaches but none seem to have worked as expected, I need to limit the number of threads as reported by

Threading.Thread.CurrentThread.ManagedThreadId

I also tried changing the ASP/behaviour/limits properties/threads per processor limit but I still get new threads with a different thread id.

I really need a limited number of threads (say 5-10) with the same thread id for each one every time it's used.

At the moment I have the following config file

<configuration>
    <system.web>
        <applicationPool maxConcurrentRequestsPerCPU="1" maxConcurrentThreadsPerCPU="1" requestQueueLimit="5000"/>
    </system.web> </configuration>

pointed to by applicationhost.config

   <applicationPools>
        <add name="DefaultAppPool" enable32BitAppOnWin64="true" CLRConfigFile="C:\Inetpub\wwwroot\SCRWeb\Data\apppool.config">
            <processModel identityType="NetworkService" />
        </add>

And yet I still see more than 1 thread id in my application as reported by Threading.Thread.CurrentThread.ManagedThreadId

Any ideas?

Thanks