This project allows NBitcoin to support Monacoin. To register Monacoin extensions, run:
NBitcoin.Monacoin.Networks.Register();
You can then use NBitcoin with NBitcoin.Monacoin.Networks.Mainnet or NBitcoin.Monacoin.Networks.Testnet.
Alternatively you can use NBitcoin.Network.GetNetwork("mona-main") to get the Network object.
You can then start using Monacoin in the same way you do with Bitcoin.