James Wiseman

This is quite well documented across the web, but nevertheless here is a set of notes that I find useful and keep referring back to:

To expose a COM Interface from a .NET Type Library so it can be called from(e.g.) VB6  or a classic ASP page we need to:

1. Ensure assembly GUID is assigned, e.g:

[assembly: Guid("dde7717b-2b75-4972-a4eb-b3d040c0a182")]

2. Ensure COMVisible attribute is True:

[assembly: ComVisible(true)]

3. Check the project option “Register for COM interop”
4. Put a GUID attribute on the class, e.g

[GuidAttribute("4df74b15-d531-4217-af7e-56972e393904")]

5. Ensure you have the namespace declaration:

using System.Runtime.InteropServices;

6. Register using Regasm.exe
7. If using VB6 Application, reference .TLB

See the following for more details:

http://bytes.com/groups/net-c/269199-calling-c-component-classic-asp