Question

I have a custom dll (not registered) that I need to access via c#. How do I do this without registering the DLL?

Edit: It is a C++ dll.

Answer 1

See Registration-Free COM Interop:

Registration-free COM interop
activates a component without using
the Windows registry to store assembly
information. Instead of registering a
component on a computer during
deployment, you create Win32-style
manifest files at design time that
contain information about binding and
activation. These manifest files,
rather than registry keys, direct the
activation of an object.

Using registration-free activation for
your assemblies instead of registering
them during deployment offers two
advantages:

• You can control which DLL version is activated when more than
  one version is installed on a
  computer.
• End users can use XCOPY or FTP to copy your application to an
  appropriate directory on their
  computer. The application can then be
  run from that directory.