@@ -0,0 +1,11 @@
+﻿namespace Nevermind.JsonRpc.DataModel
+{
+    public enum ProtocolVersion
+    {
+        EthereumMainnet = 1,
+        MordenTestnet = 2,
+        RopstenTestnet = 3,
+        RinkebyTestnet = 4,
+        KovanTestnet = 42
+    }
+}
do you reference Core? there is a EthereumNetwork class and GetNetworkId