[MonoDevelop] How to get MD to let go of a dll?

[Chip Salzenberg]

I'm using one MonoDevelop solution to create a dll that I then use in
another solution.  When I switch from the second solution back to the first
one, and try to rebuild a new version of the dll, I'm unable to overwrite it
-- presumably because the VM or MD is stlil holding open the previous
version.

What does it take for MonoDevelop to let go of a dll it had opened and used?
 Having to restart MD on every cycle is highly inefficient.

In case it matters, I'm not sharing a development directory; rahter, in a
post-compilation step, I'm copying the dll from one solution's directory to
the other's.
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