Looking for distributed, in-memory Graph DB

Question

Is there a database which will satisfy all (or at least most) of this requirements?

1. Graph oriented - optimized for storing graphs and traversal(e.g HyperGraphDB, Neo4j)
2. Running in memory, but having a persisted storage (e.g. Redis)
3. Distributed (e.g. membase)
4. Had .NET adapter (TCP/IP, not HTTP REST)

Or am I asking too much?

Thanks in advance.