Managed (.NET) Subversion Server

I'm perfectly aware that there are lots of client libraries to connect to an SVN repo, manage working copies, etc. What I'm looking for, though, is an implementation of Subversion server for .NET (or a wrapper around some low-level code).

Are there any or I'm asking for something unreas开发者_C百科onable (well, sure I do, since I understand how much effort would it take to build an SVN server basically from scratch).

VisualSVN Server if a free subversion server for Windows ... not sure if this is quite what you are after though.

Kindness,

Dan