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    <p>Building the object is very easy - registering it and managing the COM dependency can be quite tricky.</p> <p>Your .NET project should be a class library, and your class can be a straightfoward C# / .NET CLR object:</p> <pre><code>namespace MyCompany.MyProject.Com { public class MyObject { public int Width { get; set; } public int Height { get; set; } public void Load(string location) { /* implementation here */ } public void Resize(int width, int height) { /* implementation here */ } } } </code></pre> <p>Right-click your project, select Properties, Application, click Assembly Information... and ensure that "Make assembly COM-Visible" is selected at the bottom of the Assembly Information dialog.</p> <p>Build your project - you should end up with MyCompany.MyProject.Com.dll in your \bin\debug\ folder.</p> <p>Build a simple ASP webpage that looks like this:</p> <pre><code>&lt;% option explicit %&gt; &lt;% dim myObject set myObject = Server.CreateObject("MyCompany.MyProject.Com.MyObject") myObject.Width = 20 myObject.Height = 40 %&gt; &lt;html&gt; &lt;head&gt;COM Interop Demo&lt;/head&gt; &lt;body&gt; &lt;p&gt;Width + Height = &lt;%= myObject.Width + myObject.Height %&gt;&lt;/p&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Bring up that page on <a href="http://localhost/" rel="nofollow noreferrer">http://localhost/</a> and verify that you get "Server.CreateObject failed" the first time you try and run it.</p> <p>Now register your DLL as a COM object using regasm.exe, installed with the .NET framework:</p> <pre><code>C:\&gt;C:\Windows\Microsoft.NET\Framework\v2.0.50727\regasm.exe /tlb MyCompany.MyProject.Com.dll /codebase Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.4927 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. Types registered successfully Assembly exported to 'D:\WebDlls\MyCompany.MyProject.Com.tlb', and the type library w as registered successfully </code></pre> <p>Now refresh your web page, and you should see <strong>Width + Height = 60</strong> in your output.</p> <p>These instructions assume you're not running anything in 64-bit; if you are, it gets more complex. (You either need to run <em>everything</em> as 64-bit - compile a 64-bit project and use the 64-bit version of regasm.exe to register it for 64-bit COM, accessed by IIS running a 64-bit scripting host) - or manually force everything to 32-bit.</p>
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    1. USDylan Beattie
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    1. COThe problem is probably that my OS is x64 then. Isn't there any way I can make it work globally? I mean, there's got to be programs or libraries out there that needs that functionality?
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    2. COWhat do you mean "globally" - do you want to create a pure 64-bit COM object, or a x86/x64 dual-target COM object, or just configure your 64-bit system to run and host 32-bit COM DLLs ?
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    3. COI'd like to create a x86/x64 dual-target COM object that will work on any machine containing the dependencies. The COM-object is to be used by a web-server and I can't force anyone to use it in x64 or x86, it need to work for both.
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