Writing ByteString - by: federica

Hi,
I'm using your SDK (QuickOPC 2018.1, in particular OPC-UA under COM with C++) since last year.
We usually write data through WriteValue method.
I'm connected to a Fanuc OPC-UA server and I need to write a ByteString tag.
How can I do this?
I continue to receive casting error: "Cast da 'System.String' a 'System.Byte[]' non valido."

Do you know a way for detecting the type of the tag in order to handle different data type in my source code?

Thank you

Best regards,
Federica