Reading a OPC Structure in s7 1500 with VB.net - by: GusoXXL

Hello guys, im doing a code to read data from my OPC-UA server in the s7 1500.

The problems is not subscribing to a variable, the problem is subscribing to an structure of variables in the OPC-Server. The structure is similar to this:
1.-A group: Registros procesados
Inside of it we find 4 groups:
2.-Registros_ATV_izq, Registros_ATV_drch, Registros_PM1 and Registros_PM1
Then inside the ATV_izq we can find 40 variables
3.-40 variables

So to be clear, for example the structure to read the data from one variable in the Registros procesados ATV Izq is like this: "ns=3;s=""Registros_procesados"".""Registros_ATV_Izda"".""Counter encoder value"""

So now, i have done a part of code to subscribe to the group instead variable by variable cause this maybe gets some time so i have done this code but right now is not working, any help?



The part in bold gave me back info about the nodes inside the group but the next part gave me error and even cant compill.
Can you help me?

Pd: also i want to ask how can i set that the publish interval is enable? i know is by defaul enable but any command to set enable or unenable?

Thanks