The signature for LocalLB::Node::set_session_enabled_state() is as follows:
void set_session_enabled_state(
in String[] node_addresses,
in EnabledState[] states
);
The parameters are arrays and you are passing in scalars. The error is correct, the compiler cannot convert a scalar without your help.
My VB is a bit rusty so I don't have the syntax off hand. It should be something like this:
Dim node_addressess() as String = {sNodeAddress}
Dim states() as NodeAdddress.CommonEnabledState = {state}
Dim configure = Node.set_session_enabled_state(node_addresses, states)
-Joe