COM+ object activation in a different partition

Make sure your Com is public and visible. To do this, add these
tags to your Com class:

[ClassInterface(ClassInterfaceType.AutoDual)]
[Guid("41E90F3E-56C1-4633-81C3-6E8BAC8BDD70")]
[ProgId("..........")]
[ComVisible(true)] 
public class MyCom
{

Make sure your COM has been registered. You can do this using the command line:

C:\WINDOWS\Microsoft.Net\Framework\v4.0.30319\regasm "C:\.......\xxx.dll"