The newest up to date c# library for .net is .Net-Bitcoin-RPC with full documentation about each call. Very easy to use.

What newer features does yours have over the original one? I looked through your projects commit history and these are the only additions I could find: https://github.com/edmlbox/.Net-Bitcoin-RPC/commit/c06532fbf1435b114b33e7235bb1fdc7c753c397#diff-793e161d67bc194802346c5b61423b04

It looks to me like the only things you added are a wrapper class for multiple wallets, a wallet name class, a wallet directory class and a class that serializes JSON.