StringUpper not working on a variable?

This is weird. If I use the following code, StringUpper works:

However, since I have to check for @error based on the input of the InputBox, I had to move it until after the $PC variable was populated, which I figured would work the same, but it's not. If I use the following code, the contents of the $PC variable does not get converted to UPPERCASE characters:


Can someone assist me with how I can convert a variable to all UPPERCASE characters?

Regards,

TX Techie