And another question on associating Inbound Nat Rules to NICs, was :

var NetworkInterfaceNatRuleAssociation_aap = new NetworkInterfaceNatRuleAssociation("aap-nat-rule-to-nic", new NetworkInterfaceNatRuleAssociationArgs

        {             NetworkInterfaceId = _VmNics[0].Id,             IpConfigurationName = "Ipconfig1",             NatRuleId = NatRule_aap.Id,         });