C# and ModelSpace Error

I am upgrading a C# program to use AutoCAD 2000 Mechanical instead of AutoCAD 2000. When I attempt to retrieve a reference to Model Space (see code below), I get the following error:

An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in TestAutoCAD2004.exe

Additional information: Error loading type library/DLL.

Not sure what is going on. Any ideas?

<code snippet>
AutoCAD.AcadApplication oApp;
AutoCAD.AcadDocument oDoc;
AutoCAD.AcadModelSpace oMSpace;


oApp = (AutoCAD.AcadApplication)System.Runtime.InteropServices.Marshal.GetActiveObject("AutoCAD.Application");
oDoc = oApp.Documents.Add(null);
oMSpace = oDoc.ModelSpace;

 

For starters you'll need to reference the Mechnical libraries in additon to
the AutoCAD libraries. Without looking further into it, that might be part
of your problem. The other problem is that you need to set your document to
the active document.

-- Mike
___________________________
Mike Tuersley
CADalyst's CAD Clinic
Rand IMAGINiT Technologies
___________________________
the trick is to realize that there is no spoon...

 

Oops - I re-read and see you are using 2004 or 2000(?) - either way you
have to write your own com interop - that'll be a pain for all the mech
libs

-- Mike
___________________________
Mike Tuersley
CADalyst's CAD Clinic
Rand IMAGINiT Technologies
___________________________
the trick is to realize that there is no spoon...

 

Thanks Mike. I had to reference the 4 mechanical lib's in order to get this to work. I used VS.NET to write the COM wrappers for me. Thanks again.

 

Does anyone know of some good docs on intergration of C# and AutoCAD???
Thanks