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POConsume a .NET Assembly from a classic ASP page
 

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    <p>I have an old .net 2005 web site that has some asp pages and having object reference problem accessing .net dll. The maintenance task was handed down to me and the original developer is nowhere to be found :( I started at .Net already so I don't really master handling this dll hell kind of problem.</p> <p>On the arrow below is where I'm encourtering the "(0x80131500) Object reference not set to an instance of an object."</p> <pre><code>Set objCommon = Server.CreateObject("Wrapper.CommonFunctions") Dim machineBuilding ---&gt;&gt;&gt; If objCommon.IsMachineAccount(strLogin, machineBuilding) Then </code></pre> <p>I already followed these steps:</p> <ol> <li>regasm /tbl /codebase mycomdll.dll</li> <li>gacutil /i mycomdll.dll</li> <li>copy the mycomdll.dll to System32 directory</li> <li>From console, execute issreset</li> <li>If your dll is create in framework 2.0 create a "dllhost.exe.config" file in the system32 directory and put this:</li> </ol> <p><code>&lt;?xml version="1.0"?&gt; &lt;configuration&gt; &lt;startup&gt; &lt;supportedRuntime version="v2.0.50727"/&gt; &lt;requiredRuntime version="v2.0.50727"/&gt; &lt;/startup&gt; &lt;/configuration&gt;</code></p> <p>6.- Restart IIS with issreset command</p> <p>and also these ones:</p> <ol> <li>Under project properties a. Under \application\assembly information i. Check “Make assembly Com-Visible”. b. Under build i. Check “Register for Com Interop”</li> <li>DO NOT sign it.</li> <li>Make sure that IUSR has full permissions to the file.</li> <li>Restart IIS via iisreset to flush any caches.</li> </ol> <p>And still not successful running the application. Any more ideas what to check or do? Thanks!</p> <p>Emir</p>
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    1. COI had a Classic ASP app that consumed a .NET assembly via a COM wrapper and the Classic ASP code was similar to yours. Have you verified that strLogin and machineBuilding are initialized? Have you executed objCommon.IsMachineAccount from a different client to verify that the call itself isn't throwing the error?
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    2. COThanks Mayo. I tried attaching to dllhost and am able to debug through the asp codes, Yes, strLogin has my network id value; the machine building will receive the value from the call. I don't think there is a problem with the asp codes since we have a working version on production server. But, I need to make the source code working properly on my local first before I can make the change requests.
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