I have a few issues with your code. I hate Hungarian notation personally, but if you're going to use it you should try to be consistent. "txt" implies a TextBox while "lbl" implies a Label. Also, you appear to not have used a prefix for what I assume is the Button Arcadre. Also, why would you use a hidden Label? Why would you not just use a String variable?

As for your issue, how are you actually running the batch file?