Read Complex structure |OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

Hi, I am new to OPC ua and I am having problems reading structure data in a server from an opc ua client.

My code is very simple:

ComplexTypeSystem complexTypeSystem = new ComplexTypeSystem(uaClient.Session);
await complexTypeSystem.Load().ConfigureAwait(false);

EncodeableFactory.GlobalFactory.AddEncodeableType(typeof(ConfigType));

var conf = uaClient.Session.Call("ns=6;s=::Program", "ns=6;s=::Program:TestGetConfig");


IEncodeable confEncod = ExtensionObject.ToEncodeable((ExtensionObject)conf[0]);
ConfigType configuration = confEncod as ConfigType;
ConfigType casted = (ConfigType)confEncod ;

Where ConfigType is a C# class with properties equal to PLC server structure i want read :

public class ConfigType: EncodeableObject
{
        public override ExpandedNodeId TypeId => ExpandedNodeId.Parse("nsu=http://br-automation.com/OpcUa/PLC/PV/;i=100020");

public override ExpandedNodeId BinaryEncodingId => ExpandedNodeId.Parse("nsu=http://br-automation.com/OpcUa/PLC/PV/;i=100021");

public override ExpandedNodeId XmlEncodingId => NodeId.Null;

public override void Decode(IDecoder decoder)
{
}

public override void Encode(IEncoder encoder)
{

                 }

public ushort param1
{
   get;
   set;
}

public ushort param2
{
    get;
    set;
}

}

The properties value of Conf variable after call method are good but the type of Conf[0].body variable is "Opc.Ua.ComplexTyper.ne=6.i=99999.6.ConfigType" so confEncod is of the same type and configuration is null. 

If i try a direct cast the error is 

'Unable to cast object of type 'Opc.Ua.ComplexTypes.ns=6;i=99999.6.ConfigType' to type 'Quickstarts.ConsoleReferenceClient.ConfigType'

Anyone can help me?

Thanks a lot