trying to add recaptcha to an existing asp.net c# website

I have an existing website for a client which uses asp.net c# mainly due to logic for a side menu that was probably made from a template.  Recently they experienced unwanted spam from their online form and so we found a solution in google's recaptcha to add in order to further prevent this, so now I have the task to make it work as desired.

I followed the instructions as diligently at http://code.google.com/apis/recaptcha/docs/aspnet.html and got my source code to work within visual studio on my local workstation and got this example so it had no errors nor warning messages at least.  Great, I have helloworldc.aspx (see attached text file though keys are masked for security) and Bin/recaptcha.dll which I thought I could just upload to my web server via ftp, but now when I try to use the same code over on http://www.bhhlegal.com/helloworldc.aspx it blows some error messages that I don't quite get it.

While I understand in visual studio, just like doing a c#, that I need to add references to necessary dll files such as recaptcha.dll, but I'm lost as to where or what I have to do in my web server's IIS or web.config or something just to make recaptcha.dll available for our intended purposes.  

Please advise so I can at least get this done, thanks.
helloworldc.txt
accucomAsked:
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markmiddlemistCommented:
OK, well I'd try doing what its saying about the httphandlers section under system.web

That will mean your config should become:

<configuration>
    <system.web>
        <customErrors mode="Off"/>
       <httpHandlers>
           <add path="WebResource.axd" verb="GET" type="System.Web.Handlers.AssemblyResourceLoader" validate="True" />
       </httpHandlers>
    </system.web>
</configuration

Let me know what it says after doing this.
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markmiddlemistCommented:
Can you post up the actual web.config (obviously with connection strings removed), or at least the System.Web section please?
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accucomAuthor Commented:
Currently, the web.config file only contains the following for debugging purposes:

<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
</configuration>

there's a library.cs file which basically works off a designed template for side menu purposes.
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accucomAuthor Commented:
by updating the web.config file, I now get the following screen message when I click on my page:

Server Error
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

The IIS log file shows as
2012-03-14 15:44:32 192.168.10.34 GET /helloworldc.aspx - 80 - 192.168.10.157 Mozilla/5.0+(compatible;+MSIE+9.0;+Windows+NT+6.1;+WOW64;+Trident/5.0) 500 23 50 187

I had tried restarting the IIS for that site and still got same thing.
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markmiddlemistCommented:
Do you have access to the event log on the server? If so it may contain more detail on what the actual error is
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accucomAuthor Commented:
Yes I do, am not sure where under Event Viewer (Local) or elsewhere I should be looking at in particular.  

I also ran my wireshark utility and saw a few lines that said the following when I click again onto my helloworldc page:

HTTP   416 GET /helloworldc.aspx HTTP/1.1
HTTP  1434 HTTP/1.1 500 Internal Server Error (text/html)
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markmiddlemistCommented:
It'll be the Application event log you will need to look in, and you'll be looking for error events (with the red cross) at the right time - as you can reliably reproduce the issue its usually worth triggering it so there are entries at/near the top of the list, which is in descending chronological order.

I can't remember off the top of my head whether the events show as coming from IIS or asp.net (I think its the latter).
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accucomAuthor Commented:
Hmmm, interesting, I just tried my helloworldc.aspx link from home and remotely to my office workstation and it now works.  am perplexed as to why I got the error 500 at first but now it works.  Hopefully I can add this to the form tomorrow successfully.
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accucomAuthor Commented:
Not sure why it now works, but it works at least.  Hopefully it will work again tomorrow when I return to the office to proceed with the real form.
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accucomAuthor Commented:
also I just found out the following from my peer:

I changed the application pool for bhhlegal from “integrated” to “classic”. It seems works now.
I read online that coldfusion8 changes a mapping that causes integrated mode not to work.
Not sure if you changed anything with asp.net or the web.config.
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