VS 2008 pass vba udt to vb.net dll

[Muddy]

I can make a vb.net dll with a com interface and it works fine when using it from VBA (Excel). I need to pass a udt into this .net dll and I am not having luck. Ive tried passing it as an object and Ive tried defining a structure exactly like the VBA UDT and passing it that way and it still doesnt work. The error I get complaines about an unsupported interface.

Does anyone have any suggestions. If anyone knows of a small example anywhere Id appreciate being pointed to it. Ive done quite a bit of searching and cannot find anything.

I tested the dll without any udts (just passing a string) and it worked fine, so Im sure Ive got it all setup right except for the UDT passing part.

I dont need help on the VBA side ... I just need to know how to set up my vb.net dll to accept UDTs.

Thanks in advance for any help.