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    <p>Its too much to write in a comment, so I'll make it an answer....</p> <p>First, identify the .net class you want to expose to COM. I'll pick a class called CORE.</p> <p>Create an interface that describes the EVENTS that the CORE object will source (ie generate).</p> <pre><code>&lt;ComVisible(True)&gt; _ &lt;Guid("some guid here...use guidgen, I'll call it GUID1")&gt; _ &lt;InterfaceType(ComInterfaceType.InterfaceIsIDispatch)&gt; _ Public Interface ICoreEvents &lt;System.Runtime.InteropServices.DispId(1)&gt; _ Sub FileLoaded(ByVal Message As String) End Interface </code></pre> <p>Next, Create an interface for the COM exposed properties and methods of your class.</p> <pre><code>&lt;ComVisible(True)&gt; _ &lt;Guid("another GUID, I'll call it guid2")&gt; _ &lt;InterfaceType(ComInterfaceType.InterfaceIsDual)&gt; _ Public Interface ICore ReadOnly Property Property1() As Boolean ReadOnly Property AnotherProperty() As ISettings ReadOnly Property Name() As String ReadOnly Property Phone() As String End Interface </code></pre> <p>Now, create your actual .net class</p> <pre><code>&lt;ComVisible(True)&gt; _ &lt;ClassInterface(ClassInterfaceType.None)&gt; _ &lt;ComDefaultInterface(GetType(ICore))&gt; _ &lt;ComSourceInterfaces(GetType(ICoreEvents))&gt; _ &lt;Guid("a third GUID, I'll call it GUID3")&gt; _ Public Class Core Implements ICore &lt;System.Runtime.InteropServices.ComVisible(False)&gt; _ Public Delegate Sub OnFileLoaded(ByVal Message As String) Public Event FileLoaded As OnFileLoaded End Class </code></pre> <p>Now, when you need to raise the FileLoaded event, just RAISEEVENT FILELOADED(Message) from within your class. .NET will forward the event out to COM because you've hooked up the COMSourceInterfaces attribute.</p> <p>The attribute is shorthand for much of of this, but unfortunately doesn't give you quite the control that you need to do certain things (for instance retain version compatibility on your com interfaces).</p>
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    1. COThanks for the detailed answer, I've created a new project to test it. Unfortunately, there seems to be a problem: The "Implements ICore" line is raising errors for the properties--Class 'Core' must implement 'ReadOnly Property Name As String' for interface 'ICore'. Implementing property must have matching 'ReadOnly' or 'WriteOnly' specifiers. I've tried a few things myself but no obvious solution is springing out at me.
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    2. COI'm nearly there I think, drventure. Because I'd copied and pasted your code VB hadn't created the corresponding properties in the Core class--I just had to hit return on the Implements line and that solved that problem. D'oh!
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    3. CONow, I've built the class and registered it with a tlb file using regasm. The class is showing up in a VB6 test project and everything looks okay as far as the events, methods and properties are concerned--they're all showing up correctly in the IDE--but as soon as I try to create a new instance of the class I'm getting an automation error: "The system cannot find the file specified." Which seems odd as there doesn't seem to be any files being referred to anywhere in code.
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