Conditional if else on command line parameters

Inside my script I have

!echo "NAME is ${NAME}"
${If} ${NAME} == "X"
!echo "B"
${EndIf}

I parsed the /DNAME=A on the command line.

Output:

NAME is A
B

I didn't expect to see the B in the output, what is wrong with my syntax?

You're mixing up compiletime and runtime commands.
!echo is a compiletime command, and LogicLib is runtime.