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    <p>I don't see a problem with your approach either. </p> <p>Typically VS will generate an interop assembly for COM components automatically when you add a reference to the component. However, when you add a reference to one of the Office components (XP or any later version), a reference to the pregenerated (and optimized) primary interop assembly from Microsoft is added as in your first example. The line </p> <pre><code>&lt;WrapperTool&gt;primary&lt;/WrapperTool&gt; </code></pre> <p>means that this PIA is used.</p> <p>If you correctly added the PIA reference the <em>CopyLocal</em> property of this reference should be set to false and the <em>Path</em> property should be something like</p> <pre><code>C:\WINDOWS\assembly\GAC\Microsoft.Office.Interop.Excel\12.0.0.0__71e9bce111e9429c\Microsoft.Office.Interop.Excel.dll </code></pre> <p>You will find some more details on interop assemblies in this MSDN <a href="http://msdn.microsoft.com/en-us/library/aa679806.aspx" rel="noreferrer">article</a>.</p> <p>To get the first method working it is necessary that the Office Primary Interop Assemblies (PIAs) are installed on the machine. There is a redistributable version available from Microsoft: </p> <ul> <li><a href="http://www.microsoft.com/downloads/details.aspx?FamilyId=3C9A983A-AC14-4125-8BA0-D36D67E0F4AD&amp;displaylang=en" rel="noreferrer">Office 2003 PIAs</a></li> <li><a href="http://www.microsoft.com/downloads/details.aspx?familyid=59DAEBAA-BED4-4282-A28C-B864D8BFA513&amp;displaylang=en" rel="noreferrer">Office 2007 PIAs</a></li> </ul> <p>AFAIK, these PIAs only get installed by the Office setup when the .NET Framework has already been installed, that's why there is a separate redistributable for the PIAs.</p> <p>Note: Make sure that you reference the version of Office that you are targeting. When targeting several versions of Office, you might get some problems however. A solution in that case might be late binding (if performance is not an issue).</p>
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    1. PODifferent Interop references on two different computers doesn't work
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    1. COAlso note, that the PIAs contain additional glue code that avoids memory/resource leaks that could happen when using the generated interop assemblies.
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      1. USDavid Schmitt
    2. COHow would I got about ensuring the PIA gets used and not the generated interop. I believe I am seeing the memory/resource leaks mentioned in @David Schmitt's comment
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      1. USmindless.panda
    3. CO@user260197: The PIA should be properly installed on the system. You can get a setup from Microsoft that will handle installation. It is especially important, that the PIA is in the GAC and *registered*. See the details in http://msdn.microsoft.com/en-us/library/aa679806%28office.11%29.aspx
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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