How to concatenate decimal or hex values with the string name?

Hi Dave,
I am using the first solution that you mentioned above to concatenate two strings.

But currently I am facing some issue to convert the string into capital alphabets.The issue is described as follows.

Let us suppose I have 'h00c value that I need to concatenate with some string “register_”.
But my requirement is I need a string “register_00C” as output(C should be in capital).

I have tried the following solution but it doesn’t works.
I am able to get the string “register_00c” by concatenation method.But as I need the capital C,I converted “00c” string into capital but in that case the result I am getting is " C" i.e the zeros are replaced by spaces.

If I pass 'h00C in hexadecimal it automatically considers it as 'h00c.

So do you have any solution about this.